COMPLETE THE FOLLOWING QUESTIONS (15 points) (3 points) A new phenotype of mouse

Question

COMPLETE THE FOLLOWING QUESTIONS (15 points) (3 points) A new phenotype of mouse has been discovered -short-tails. You have been given a short-tailed mouse and do not know a tailed mouse with a long-tailed mouse. Multiple crosses of your short-tailed mouse to long-taile mice produces 27 long-tailed mice and 25 short-tailed mice. When you cross these short-tailed progeny with each other, you get 31 short-tailed mice and 11 long-tailed mice. What was the genotype of the original short-tailed mouse? What is the genotype of the long-tailed mice used in this breeding experiment? Short tailed mouse Long-tailed mouse: 1. nything about its genotype. You decide to cross your sho

Explanation / Answer

Case1:

Short tailed× long tailed

It produced short and long tailed progeny in 1:1 ratio (appropriate).

Case2:

Short tailed×short tailed

It produces short and long tailed in 3:1 ratio.

From case 2, we can infer that genotype of short tail should be heterozygous , say Aa.

Thus , short tail should be dominant trait.

Hence, in case 1,

Genotype of short tail mice should be Aa. (Heterozygous).

Genotype of long tailed mice should be aa. (Homozygous recessive).

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