Question

n mice, dwarfism is caused by an X-linked recessive allele, and pink coat is caused by an autosomal dominant allele (coats are normally brownish). If a dwarf female from a pure line is crossed with a pink male from a pure line, in the F2 generation, what will be the probability of getting a dwarf and pink female?

Answer 1

The probability of getting a dwarf and pink female is 1/2

Step-by-step explanation:

In mice, dwarfism is caused by an X-linked recessive allele, and pink coat is caused by an autosomal dominant allele where coats are normally brownish.

A dwarf female from a pure line will have Xd Xd where d represent the recessive trait and the female is also brownish (pp).

A pink male from a pure line will be XPY where P represent the dominant allele but not a dwarf (D).

Xd Xd Xp Xp

XD XDXd XDXd XP XPXp XPXp F1 generation

Y XdY XdY Y XpY XpY

P XDXd x XdY XPXp x XpY

XD Xd XP Xp

Xd XDXd XdXd Xp XPXp XpXp F2 generation

Y XDY XdY Y XPY XpY

The probability of getting a dwarf and pink female is 1/2