Question

Agouti is a type of coat-color pattern in mice that cannot be expressed in albinos (white mice). Non Albino mice without the dominant agouti allele ( AAbb and Aabb) are black. An agouti mouse that is heterozygous at the albino ( A) and agouti ( B) loci ( AaBb) is mated to an albino mouse that is heterozygous at the agouti locus ( aaBb). What percent of the progeny are likely to be agouti

Answer 1

The percentage of the progeny that are likely to be Agouti = 37.5%

Step-by-step explanation:

From the given information;

An agouti mouse that is heterozygous at the albino ( A) and agouti ( B) loci ( AaBb) is mated to an albino mouse that is heterozygous at the agouti locus ( aaBb).

Agouti mouse = AaBb

If the Agouti mouse self cross; gamete needed for the crossing will be:

AB, Ab , aB, ab

Albino mouse = aaBb

If the Albino mouse self cross; gamete needed for the crossing will be:

aB, ab, aB, ab

The crossing can now be represented in a punnet square as shown below:

AB Ab aB ab

aB AaBB AaBb aaBB aaBb

ab AaBb Aabb aaBb aabb

aB AaBB AaBb aaBB aaBb

ab AaBb Aabb aaBb aabb

The objective if this question is to determine the percentage of the progeny that are likely to be agouti

Let's recall that for a progeny to be agouti ; There is need for the genotype of such agouti mouse to be dominant for both traits or heterozygous for both traits.

Thus; we have;

AaBB , AaBb , AaBb, AaBB, AaBb, AaBb = 6/16

The percentage of the progeny that are likely to be Agouti = 0.375

= 37.5%

Answer 2

37.5%

Step-by-step explanation:

These here are

Black (AA or Aa) and albino (aa)

Agouti (Bb or BB)

Thus, a cross between

AaBb and aaBb

The percent of the progeny which are likely to be agouti would be

A. a. B. b

a. Aa. aa. B. BB. Bb

a. Aa. aa. b. Bb. bb

The probability of agouti would be

1/2 (Aa) * 3/4 (BB or Bb)

= 3/8

= 37.5%