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The cat breeder has found a cat that carries a gene that causes them to have bea

ID: 174380 • Letter: T

Question

The cat breeder has found a cat that carries a gene that causes them to have beautiful steel gray fur However, the allele for gray fur is recessive. If the dominant allele is present the cat will be completely white. Both cats are in high demand though. If the breeder purchases a purebred cat that is steel gray and has a short tail, what will be the result if he crosses it to a purebred white cay with a long tail? Draw the punnett square and determine the genotype and phenotype ratios below. If the cat breeder takes a brother and sister from the cats born above and crosses them, what would be the distribution of phenotypes (the phenotypic ratio) and the genotypes? Complete the punnett square below - show the gametes on both sides and fill in the phenotypes/genotypes and then count them up.

Explanation / Answer

The cat breeder has found a cat that carried a gene causes them to have a beautiful steel

gray hair----------recessive---------allele –w

white -----dominant--------------- allele –W

gray hair, short tail --- GENOTYPE ----ww SS

white,LONG TAIL GENOTYPE-------------WW ss

gray hair, short tail --- ww SS     x white, LONG TAIL GENOTYPE-------------WW ss

f1---------offspring---------- Ww Ss     -----------------white and short tail

f1---------offspring---------- Ww Ss     x WWss        white cat with long tail( pure

WS  

W s    

w S    

w s    

Ws

WS   Ws

white short tail

W s     Ws

White long tail

w S     Ws

white short tail

w s     Ws

white long tail

Ws

WS   Ws

white short tail

W s     Ws

white long tail(

w S     Ws

white short tail

w s     Ws

white   long tail(

Ws

WS   Ws

white short tail

W s     Ws

white long tail

w S     Ws

white short tail

w s Ws  

white short tail

Ws

WS   Ws

white short tail

W s     Ws

white long tail

w S   Ws

white short tail

w s Ws  

white long tail

white short tail

9/16

White long tail

7/16

phenotype the F2 ratio 9:3:3:1 is modified to   9:7. Due to epistatsis

WS  

W s    

w S    

w s    

Ws

WS   Ws

white short tail

W s     Ws

White long tail

w S     Ws

white short tail

w s     Ws

white long tail

Ws

WS   Ws

white short tail

W s     Ws

white long tail(

w S     Ws

white short tail

w s     Ws

white   long tail(

Ws

WS   Ws

white short tail

W s     Ws

white long tail

w S     Ws

white short tail

w s Ws  

white short tail

Ws

WS   Ws

white short tail

W s     Ws

white long tail

w S   Ws

white short tail

w s Ws  

white long tail

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