Answer all of 5 Test your genetic hypothesis Ho with a chisq

Test your genetic hypothesis (H_o) with a chi-square test. Black fur in mice (B) is dominant to brown fur (b). Short tails (T) is dominant to long tails (t). A brown mouse homozygous for short tails is mated with a homozygous black mouse with long tails. a What is the genotype and phenotype of the F1 progeny? How many genetically different gametes could the F1 progeny form? Give the gametic genotypes and gametic ratios for a F1 mouse. An F1 mouse mates with a mouse that is brown and possesses a long tail. Use the fork line method to determine what genotypes and the genotypic ratio of progeny that are expected from this cross?

Solution

A) The genotype and phenotype of the F1 progeny is Black Fur (B) Short Tail (T), Brown Fur (b) Short Tail (T), Black Fur (B) Long Tail (t) and brown fur (b) long tail (t).

B) The number of the genetically different gametes would be eight.

C) The gametic genotypes for the F1 progeny mouse would be as follows BT, Bt, bT and bt. The gametic ratio would be 1:1:1:1

D) THe genotypic ratio of the F2 progeny would be 12:6:6:2.