The genetic composition of a normal male child is XY.
Explanation:The genetic composition of a normal male child is determined by the sex chromosomes inherited from the parents. A male child inherits one s-ex chromosome from the mother (X) and one from the father (Y). Therefore, the genetic composition of a normal male child is XY.
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In a species of mice, brown fur color is dominant to white fur color. when a brown mouse is crossed with a white mouse all of their offspring have brown fur. why did none of the offspring have white fur?
Answer:
Because white fur is determined by a resessive allele. Resessive alleles are only expressed if they pair with another resessive allele.
Explanation:
The physical characteristics of the mice shown in the above question are determined by the dominance relationship between the genetic alleles. As we can see from reading the question, brown fur is a trait regulated by a dominant allele, in mice, on the other hand, white fur are a trait regulated by recessive alleles.
Dominant alleles are so named because certain genetic traits prevail over others. This is because dominant genes do not need their dominant allele pair on the chromosome, that is, they do not need to be double-dose in the genotype to manifest. However, recessive alleles are so named because to manifest their hereditary characters one must present a double dose in the genetic code.
In this way, we can define the reason that prevented the offspring, shown in the above question, from presenting white fur. Because white fur is recessive, it would require both parents to have white fur for this trait to be passed on to their offspring.
Which drug has the greatest effect on your senses?
what is the value of x+ 3y + z if x = 3, y = 3, and z = 4
Goosebumps are caused by contractions of the
Goosebumps occur when the arrector pili muscles, tiny muscles attached to each hair follicle, contract. This is a survival mechanism inherited from our ancestors and can occur in response to emotions or cold weather.
Explanation:Goosebumps are caused by the contractions of tiny muscles at the base of each hair follicle known as arrector pili muscles. When these muscles contract, they cause the hair to stand upright, creating what we identify as goosebumps. The physiological reaction is a vestigial reflex inherited from our distant ancestors whose body hair would stand up to make them appear larger when faced with threats. In modern human, it is often associated with emotional responses such as fear, inspiration, awe, or cold weather.
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Three species of lizard, labeled A, B, and C, are being studied using molecular analysis by two research colleagues in different laboratories. The mitochondrial DNA of lizards A and B are compared and are found to differ by 0.1%. The ribosomal RNA of lizards B and C are found to differ by 0.02%. They compare their findings and conclude that lizard B is more closely related to C than to A. What is the flaw in their reasoning, and how can their analysis be improved?
A. They applied different mathematical formulas for their computations. They should recalculate using the same formulas.
B. They compared different molecules which have different mutation rates. They should compare same molecule in the lizards.
C. They only made one measurement each. They should repeat their measurements to reduce the uncertainty in their results.
D. They used different equipment for analyzing the molecules since they work in different labs. They should work in the same lab.
Answer:
The most appropriate answer would be option B.
The flaw in their reasoning is that they compared different molecules in a different set of organisms.
For example, they compared the DNA of lizard A and B whereas they compared the RNA of lizard B and C.
In addition, the mutation rates of different molecules (DNA and RNA) are different and thus, comparison of DNA in one set of organism and comparison of RNA in another set cannot be used as the basis for the conclusion.
Answer:
B. They compared different molecules which have different mutation rates. They should compare same molecule in the lizards.
Explanation:
The researchers shown in the question above wish to discover the genetic relationship of three lizards based on analyzes of different molecules. The researchers evaluated the difference between DNA in lizards A and B and evaluated the difference between RNA molecules between lizards B and C, so it is not possible to detect a genetic relationship between lizards. The correct thing would be for researchers to investigate only the DNA of all lizards, or just the RNA of all lizards.
Ms. golightly was diagnosed with breast cancer. the tumor was removed along with a large area of surrounding tissue and lymph nodes. this type of surgical procedure is called ________ resection.
When you copy a selection of cells using drag and drop, which appears before you release the mouse button?
Final answer:
While copying cells in Excel with drag and drop, a moving dashed line border signifies the selection being copied. Releasing the mouse button pastes the content into the destination cells, with Excel's AutoFill feature updating any formula references.
Explanation:
When you copy a selection of cells using drag and drop in Excel, a border appears around the selected cells indicating the area to be copied. This border is typically represented by a moving dashed line, which persists around the selection until you release the mouse button. Once you drag the selection to the new location and release the mouse button, the selected cells' contents are copied to the destination cells. As you drag the cells to the point of destination using the fill handle, you may also see a ghost-like preview of the data that will be entered into the destination cells.
Moreover, if you're copying and pasting formulas that contain cell references, Excel's AutoFill feature will update these references relative to the destination cells. This functionality is particularly useful for maintaining the integrity of formula calculations throughout a spreadsheet. The fill handle is an essential tool for leveraging this powerful feature.
In fishes, pharyngeal pouches may develop into
Although against your better judgement, you squeezed an acne pustule on your face. now you notice a clear fluid seeping from the opening. what is the role of the clear fluid?
The skin becomes _________ when red blood cell perfusion to the capillary beds of the skin is poor.
True or False: If you refuse to submit to a breath, urine, or blood test, it is admissible as evidence in DUI criminal proceedings in Florida.
Answer;
The above statement is true;
If you refuse to submit a breath, urine, or blood test, it is admissible as evidence in DUI criminal proceedings in Florida.
Explanation;
-Florida law requires you to take a breath, blood, or urine test if you are arrested for a DUI.
-If individuals are lawfully arrested by an officer who has probable cause to believe that they have been driving under the influence, then they consent to taking a chemical test of blood, breath or urine for the purpose of determining the blood alcohol content (BAC) or for drugs. If a person refuses to submit to a breath, urine or blood test, it is admissible as evidence in DUI criminal proceedings.
The hypothesis,which says lightning struck the earth causing tiny organic molecules to join and form living organisms, is historically known as
The most common type of stroke is cerebral hemorrhage. cerebrovascular occlusion. cerebral aneurysm. cerebral ischemic attack.
During activity and at rest, which type of body tissue burns the most calories?
When organisms have a similar niche, __________ may occur.
An organ of common tissue between the mother and the growing embryo is called the
Choose the answer that best describes the liverâs role in lipid digestion. choose the answer that best describes the liverâs role in lipid digestion. the liver creates lipocytes, which are cells that store lipids. the liver creates bile, a soapy compound that emulsifies lipids. the liver creates vitamin k, which is needed for lipid absorption. the liver creates digestive enzymes, which are needed to break down lipids.
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A scientist conducts an experiment to test the effects of light on earthworm activity. Which is a variable in this experiment?
Which represents the point in Earth’s revolution around the Sun when it is at aphelion?
A) in early July
B) in early April
C) near the first day of winter in December
D) in early January
E) in early September
Which of the following would most likely happen if the epithelial cells in the stomach failed to produce mucus?
A. Gastric juice would digest the stomach lining, resulting in ulcers.
B. Food leaving the stomach would only be partially digested.
C. Stomach pH would increase, resulting in acid reflux disease.
D. The cells would break down more slowly in order to protect the stomach.
Answer:
A. Gastric juice would digest the stomach lining, resulting in ulcers.
Explanation:
Because when the cells fail to produce mucus thats when gas comes in.
C) what is the overall charge of the most abundant tripeptide species at neutral ph (ph 7.0)?
At a neutral pH of 7.0, the amino and carboxyl groups of amino acids are partially ionized.
The charge of a tripeptide relies on its amino acids and their pKa values. The tripeptide's three-letter amino acid code can be used to analyse charges at neutral pH:
Acidic amino acids like aspartic and glutamic acids are negatively charged at pH 7.0.
At pH 7.0, basic amino acids like lysine, arginine, and histidine are positively charged.
At pH 7.0, neutral-side amino acids like glycine, alanine, and leucine are uncharged.
The tripeptide's charge is the total of its amino acid charges. We require tripeptide sequence amino acid information to find the most prevalent tripeptide species at neutral pH.
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The overall charge of the most abundant tripeptide species at neutral pH (pH 7.0) depends on the individual amino acids in the tripeptide and their respective charges. If the amino acids have neutral side chains, the tripeptide will have a neutral overall charge. If one or more amino acids have positively or negatively charged side chains, the tripeptide will have a positive or negative overall charge, respectively.
Explanation:The overall charge of the most abundant tripeptide species at neutral pH (pH 7.0) depends on the individual amino acids present in the tripeptide. In general, at neutral pH, amino acids can exist in different forms depending on the pH of the solution. Amino acids can either be positively charged (cationic), negatively charged (anionic), or neutral. The overall charge of the tripeptide can be determined by considering the charges of the individual amino acids and their respective pKa values.
For example, if the tripeptide consists of three amino acids with neutral side chains at neutral pH, then the overall charge of the tripeptide would be neutral. However, if one or more of the amino acids have positively or negatively charged side chains, then the overall charge of the tripeptide would be either positive or negative, respectively. It's important to note that the specific amino acids present in the tripeptide would determine the overall charge at neutral pH.
Gases from __________ continue to play an important role in the climate and the long-term composition of the atmosphere.
Which rays of the electromagnetic spectrum are responsible for causing sunburn when you spend too much time exposed at the beach?
A) Ultraviolet
B) X-rays
C) Gamma
D) Visible
E) Infrared
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If the CO2 levels in the atmosphere increase, the average temperature on Earth will most likely ?
Answer:
increase
Explanation: PLATO
CO2 is a greenhouse gas. It traps infrared light and prevents it from leaving Earth. So, if the level of CO2 increases, more heat will be trapped, which will result in an increase in Earth’s average temperature.
Polysaccharides are composed of what monomers (building blocks)?
A patient is taking bismuth subsalicylate [pepto-bismol] to prevent diarrhea. the nurse performing an assessment notes that the patient’s tongue is black. what will the nurse do?
Why ornithine is unlikely to be found in proteins in vivo mcat?
Ornithine is unlikely to be found in proteins in vivo mcat because not every amino acid found in the human body is identified by a codon in the genetic code or merged into proteins, that is Ornithine.
Ornithine is found as one of the intermediates in the urea cycle, the process of metabolism when the body excretes excess nitrogen.
While analyzing a karyotype genetics identify a missing chromosome. Which term describes this chromosomal abnormality
Answer: Aneuploidy
Explanation:
Aneuploidy is the presence of abnormal normal of chromosomes in a cell. Example: The chromosomes number 45 or 47 chromosomes which is not common in case of human beings.
The normal number of chromosomes in human beings is 46. This results in different syndromes which can cause deformities in the body of the individual.
It leads to miscarriage in most of the cases the survival is very less.
The underlying assumption of the harrod-domar growth model is that
The underlying assumption of the Harrod-Domar growth model is that Growth is mainly determined by capital accumulation through savings
The Harrod-Domar model is a model of economic growth. According to the Harrod-Domar model, economic growth depends on two important factors, the saving ratio and the capital output ratio.
What are the animals species called that exhibit long gestation periods, give birth to relatively large offspring and maintain population numbers close to the habitat carrying capacity?
The animal species with long gestation periods, large offspring, and numbers close to habitat carrying capacity are called K-selected species. They have fewer offspring but provide extensive parental care. Their strategy contrasts with r-selected species, who produce many offspring but offer little parental care.
Explanation:The animal species that exhibit long gestation periods, give birth to relatively large offspring, and maintain population numbers close to the habitat carrying capacity are known as K-selected species. These species, including many mammals like humans, kangaroos and pandas, as well as certain plants like oak trees, have few offspring during a reproductive event but provide extensive parental care to them.
Despite being larger at birth, the offspring of these species are relatively helpless and require time and care to develop skills needed to compete for natural resources. The investment in long-term parental care exemplified by these species, however, can sometimes come at the expense of their own health.
In ecological theory, this K-selection strategy is contrasted with r-selection, wherein species produce many offspring but provide little to no parental care. The terms k-selection and r-selection refer to the ecological concepts of carrying capacity (K) and intrinsic growth rate (r) respectively.
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