Colorblindness is an X-linked recessive trait. Let us assume that a colorblind man has a colorblind...

Colorblindness is an X-linked recessive trait. Let us assume that a colorblind man has a colorblind sister and his mother has normal vision.

What is the genotype, as to color vision, of this man’s mother and of his father?

What kind of color vision will his sons and his daughters have, and in what ratios, if he marries a woman identical in genotype to his mother?

Solutions

Expert Solution

Let the alleles be XC- normal, Xc- colourblindness

the man and his sister are colourblind and his mother has normal vision this shows his mother is heterozygous carrier and his father is colourblind, so genotype of his father is XcY and genotype of his mother is XCXc.

XCXc * XcY

	XC	Xc
Xc	XCXc ( carrier female, with normal vision)	XcXc ( colourblind female)
Y	XCY ( normal male)	XcY ( colourblind male)

it is possible to have colourblind female, colourblind male, carrier female and normal male.

If the man marries a heterozygous female ( female who has the same genotype as that of his mother)

XCXc * XcY

	XC	Xc
Xc	XCXc ( carrier female, with normal vision)	XcXc ( colourblind female)
Y	XCY ( normal male)	XcY ( colourblind male)

the possible genotypes and phenotypes and given in the punnet square.

the ratio is

carrier female: colourblind female: normal male: colourblind male=1:1:1:1

gladiator answered 11 months ago

Next > < Previous

Related Solutions

Suppose colourblindness is an X-linked recessive trait, while Huntington's disease is an autosomal dominant trait. Assume...

Suppose colourblindness is an X-linked recessive trait, while Huntington's disease is an autosomal dominant trait. Assume both traits are rare. A colourblind man decides to have children with a women who is heterozygous for both genes. What is the probability that they will have a child that is colourblind and does not have Huntington's?

Colorblindness is a sex linked trait in humans. Normal vision is a sex linked dominant trait....

Colorblindness is a sex linked trait in humans. Normal vision is a sex linked dominant trait. A man’s maternal grandmother had normal vision; his maternal grandfather was colorblind; his mother is colorblind; his father has normal vision. What are the genotypes of the two grandparents and parents mentioned? What type of vision does the man have himself? What type have his sisters? If he should marry a woman genotypically like one of his sisters (he is not marrying one of...

If an X-linked recessive trait was lethal to the development of an embryo, answer the following...

If an X-linked recessive trait was lethal to the development of an embryo, answer the following questions: A. could carrier females pass this trait to sons that survive child birth? B. could carrier females pass this trait to daughters that survive child birth? C. could fathers pass this trait to daughters that survive child birth? D. could fathers pass this trait to sons that survive child birth?

#9 In humans red-green colorblindness is inherited in an X-linked recessive pattern. Polydactyly (extra fingers and...

#9 In humans red-green colorblindness is inherited in an X-linked recessive pattern. Polydactyly (extra fingers and toes) is inherited in an autosomal dominant pattern. A woman with polydactyly (heterozygous) and normal vision marries a man with red-green colorblindness and normal fingers and toes. What phenotypes would you expect to see among their children?

#9 In humans red-green colorblindness is inherited in an X-linked recessive pattern. Polydactyly (extra fingers and...

An X-linked recessive allele, r, produces red-green colorblindness in humans. A normal woman whose father was...

An X-linked recessive allele, r, produces red-green colorblindness in humans. A normal woman whose father was colorblind marries a colorblind man. a. What is the chance that the first child from this marriage will be a colorblind boy? b. What is the chance that the first child from this marriage will be a colorblind girl? c. If the couple have three children, what is the probability that two of them will be colorblind boys and one will be a normal...

QUESTION 6 Red-Green colorblindness is a X-linked recessive disorder. Huntington’s is an autosomal dominant disorder. Susan’s...

QUESTION 6 Red-Green colorblindness is a X-linked recessive disorder. Huntington’s is an autosomal dominant disorder. Susan’s father is color blind and has Huntington’s disease and is heterozygous for the Huntington’s allele. Her mother is normal and has no history of colorblindness or Huntington’s in her family. Her brother has developed Huntington’s but is not colorblind. Her husband Greg is healthy and has no incidence of either disorder in his family. Susan is not colorblind and has not yet be tested...

A normal man marries an affected woman with an X-linked recessive disease. The expected genotypes of...

A normal man marries an affected woman with an X-linked recessive disease. The expected genotypes of their offspring are_________.

Albinism is a recessive trait. An albino man has children with a non-albino woman whose mother...

Albinism is a recessive trait. An albino man has children with a non-albino woman whose mother was albino and father was not. What is the chance their child will be albino?

a. Red green color blindness is a sex linked recessive trait. If a woman with normal...

a. Red green color blindness is a sex linked recessive trait. If a woman with normal vision whose father is colorblind marries a man with colorblindness. What would be the probability that they have a colorblind child? b. Two parents have ABO blood group genotypes. Which of the following blood types could not belong to one of their children? AB, B, O, A. c. A women who is a carrier for colorblindness marries a normal male. What is the probability...

Subjects