Name. 14 points) Hagrid, the gamekeeper at Hogwarts, has been breeding magical f

Question

Name. 14 points) Hagrid, the gamekeeper at Hogwarts, has been breeding magical female owl with The F1 green and blue spotted eyes. When the F1 owls were crossed the ollowing results are res for his care of magical cr green eyes was crossed to a true-breeding brown owl with blue eyes. male owls were brown with green eyes while the F1 females were brown with obtained F2 Owls Males Females total Golden, Blue eyes Golden, Spotted 1e Golden, Green eyes eyes Brown, Blue eyes 3 B Brown Green eyes 3 Brown, Spotted0 total 16 a. How is feather color inherited? (f points) Sex linkca b. How is eye color inherited? (1 points) c. Place the genotypes for each phenotype in the boxes above. (8 points) Define your alleles below. allele Brown Feathers Golden Feathers Blue Eyes Green Eyes -Co Spotted eyes 0 d. Explain why some owls have spotted blue and green eyes (4 points) nacha-hon Cvossna over ofthe aene with blue eues gene bsith green e IO

Explanation / Answer

a. Feather color is an autosomal trait.In the generation P the male owl had brown feather color that was a dominant form - BB and the female had white feather color that was a recessive one - bb.So in F1 all male and female progenies had brown feather color as it was dominant and they all had the heterozygous form - Bb.

b. Eye color is a sex linked trait specifically a X chromosome linked trait.The male owl of generation P had blue eyes of recessive form - gg and the female had green eyes of dominant form - GG.In the F1 genertaion female progenies inherited green and blue spotted eyes ; it is an example of codominance where presence of both alleles are observed.But in case of male progenies only green eyes were observed because male has one X chromosome so only one dominant (G) allele the males inherited from their mother and chromosome Y from their father(Y chromosome does not carry that trait).

c. Brown feathers - BB , Bb

Golden/white feathers - bb

Blue eyes - gg

Green eyes - GG

Spotted eyes - Gg

d. Because of codominance , it is a state where if both dominant and recessive allele is present that is in case of a heterozygous condition it shows expression of both alleles.

F2 Owls Males Females Golden,Blue eyes bb,XgY Golden,Green eyes bb,XGY bb,XGXG Golden,Spotted eyes bb,XGXg Brown,Blue eyes BB/Bb,XgY Brown,Green eyes BB/Bb,XGY BB/Bb,XGXG Brown,Spotted eyes BB/Bb,XGXg

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