Question

. For each of the following sets of data, provide the genotypes of all individuals involved in the cross.  The letter symbol you use to indicate the genes is your choice.  Be sure to follow standard genetics conventions in naming alleles.  

1. First generation: Agouti (gray fur) crossed with a black fur mouse

                     Progeny:       all agouti

     2^nd generation: two Agouti progeny from the 1^st cross are crossed

                                Progeny:       8 Agouti, 3 black fur

Include all possibilities in your answers: where more than 1 possibility exists, give all the possible answers.

	Agouti mouse	Black fur mouse
Parental Genotypes:
Genotype(s) of the F1 progeny:

F2 generation:	Agouti F2 progeny	Black fur F2 progeny
Genotype(s):

Answer 1

Answer- it is clear from thw crosaes that Agouti is the dominant phenotype and black is recessive.

Let allele for agouti be A

And allele for black fur be a

Generation 1

Agouti crossed with black fur so,

Parents- AA x aa

	a	a
A	Aa	Aa
A	Aa	Aa

All offsprings are agouti in phenotype and heterozygous Aa genotype.

Generation two

Agouti x agouti

Aa x Aa

	A	a
A	AA	Aa
a	Aa	aa

There is a 25% chance offsprings are black aa .

Phenotypic ratio is 3:1 that is agouti is to black.

Genotypic ratio is 1:2:1

8 agouti and 3 black mice are almost approximately 3:1 phenotypic ratio.

	Agouti	black
Genotypes of parents generation-l	AA	aa
Genotypes of offsprings generation-l	Aa	-
Genotypes of F2 generation	Aa / AA	aa

Black fur color is recessive so it will alway be genotype homozygous recessive.

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