2. Null mutations are valuable genetic resources becausethey allow a researcher to determine what happens to anorganism in the complete absence of a particular protein. However, it is often not a trivial matter to determinewhether a mutation represents the null state of the gene.a. Geneticists sometimes use the following test forthe nullness of an allele in a diploid organism: If theabnormal phenotype seen in a homozygote for theallele is identical to that seen in a heterozygote(where one chromosome carries the allele in question and the homologous chromosome is known tobe completely deleted for the gene) then the alleleis null. What is the underlying rationale for thistest? What limitations might there be in interpreting such a result?

Q: 1. In humans, widow’s peak (W) is dominant over having a straight hairline (w). If a homozygous man…

A: Since you have posted multiple parts, we will solve the first question for you. To get the remaining…

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Q: 2. Imagine a combination of microevolutionary mechanisms other than mutation/se- lection. How do you…

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Q: 2. Uniparental disomy is a rare phenomenon in whichonly one of the parents of a child with a…

A: Hello! Since you have posted multiple questions, we are answering only first two questions. If you…

Q: 2. In four-o’clocks, the allele for red flowers is incompletely dominant to the allele for white…

A: Hi! Since you have posted multiple questions, we are answering only first two sub-parts.   According…

Q: 6. A person is simultaneously heterozygous for two autosomal genetic traits. One is a recessive…

A: (a) Figure of the metaphase of mitosis is as follows:

Q: 7. It has long been known in the field of human genetics that wavy hair is the expression of a…

A: Heterozygous Genotype - It is the presence of  2 different alleles at a gene locus, including one…

Q: 8. contrast the inheritance of linked genes with unlinked genes

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Q: what is the probability that he might be a carrier of the recessive gene?

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Q: 6. Color blindness is a recessive X-linked trait (a). A woman whose father is colorblind possesses…

A: As colourblindness is an X linked recessive diseases.So, XcXc = Homozygous recessive ,Colourblind…

Q: 7. If the a and b loci are 20 m.u. apart in humans and anA B / a b woman mates with an a b / a b…

A: Recombination frequency is the rate of occurrence of recombination between a pair of linked genes.…

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Q: 3. With modern molecular methods it is now possibleto examine variants in DNA sequence from a…

A: Given genotype, John’s father = B1 B2 and D1D 4 Mother = B3B3 and D 2D 3

Q: 3. In humans, hemophilia is a sex-linked recessive trait. If a female who is a carrier for…

A: Note: Since you have asked multiple questions, we will solve the first question for you. If you want…

Q: Given the karyotype shown here, is this a male or a female? What would the genotype/phenotype of…

A: Karyotyping is the method of pairing and ordering all of an organism's chromosomes, resulting in a…

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Q: 3. Hemophilia is a recessive sex-linked disease carried on the X chromosome in humans. Cross a woman…

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Q: 9. (a) A child has a rare recessive disease due to a mutation in Gene X; both his parents are…

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Q: 3) You have identified an interesting mutant in gene P. Using a Punnett square, demonstrate the…

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Q: Describe how a cross between two closely related organisms may result in genetic problems.

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Q: 6. Section 2.6 describes several lines of support for the concept that "that variation in DNA on its…

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Q: 1. Why is pedigree analysis important?

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Q: A woman has the ABO genotype AO. A man has the ABO genotype BO. What are the possible phenotypes for…

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Q: please answer 6 a and b.

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Q: 28. Which of the following statement is incorrect A. Not all organisms with the same genotype look…

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Q: Discuss the basic structure and function of DNA as the genetic material.

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A: Complementation test is used in this case to find the number of genes.

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A: (Please note that you have submitted multiple questions simultaneously, we are not able to answer…

Q: 3. How can one use a pedigree chart to hypothesise how a certain condition is transmitted? Can a…

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Mitochondrial Mutations

A mitochondrion is a cellular organelle that serves as the site for cellular respiration and energy production (ATP or Adenosine Triphosphate). It is a double-membrane-bound organelle and is only present in eukaryotic cells.