Genetics. I need help answering these based off this model. If I could get some

Question

Genetics.

I need help answering these based off this model. If I could get some that would be absoultely great. Thank you! It is very much appreciated.

Model:

a. How many x chromosomes do fertile/typical drosopila males have? y chromosomes?

b. is the white eye trait recessive or dominant? explain?

c. which chromosome harbors the white eye gene?

d. how many of the white eyed alleles must a fly have to produce a white eyed male? a white eyed female?

e. are white eyed males hemizygous or homozygous for the white eye gene?

f. what is the distribution of white eye genotypes and phenotypes resulting from a white eyed female/red eyed male mating? first list the parental genotypes then use the punnett square to demonstrate the result of this particular cross.

g. what distribution of white eye/red eye would you expect when crossing a heterozygous red eyed female with a red eyed male? first list the parental genotypes then use the punnett square to demonstrate the result of this particular cross.

h. red green color blindness is an x linked recessive trait in humans. pat's father is red-green colorblind and pat's mother is normal (homozygous dominant). is pat colorblind (pat is a female)? explain.

i. with the situation in the previous question, pat married a normal vision male jeff. could pat's offspring be red-green colorblind? explain.

j. cystic fibrosis is inherited as an autosomal recessive. assume pat (a female) is normall for both cystic fibrosis and colorblind (her father is color blind). pat married jeff who is normal for both traits. their son is color blind with cystic fibrosis. this couple comes to you for genetic cousneling. list pat and jeff's genotypes. what is the probability that their next child will be normal for both traits?

Thank you.

Explanation / Answer

is the white eye trait recessive or dominant? explain?

Wild-type fruit flies have dark red eyes, but there are recessive alleles of this eye color gene (called the white gene) that cause individuals to have white eyes. As recessive trait, the white eye phenotype is masked by the presence of a wild-type (red encoding) allele

how many of the white eyed alleles must a fly have to produce a white eyed male? a white eyed female?

To be a white-eyed female, a fly must inherit two X chromosomes must carry the white-eye allele. This could occur only if both X chromosomes in the female stayed together and the male gamete contained a Y chromosome. The white-eyed females would be XXY. To produce a red-eyed male, a female gamete lacking any sex chromosomes could unite with a normal male gamete carrying the Xw+. This would produce an X0, red-eyed male.

which chromosome harbors the white eye gene?

white-eye trait is carried on the X.

Related Questions

Navigate

• Browse (All)
• Browse G
• Subjects

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.