can i have the solution to question B pls Diagnostic Problem

can i have the solution to question B pls

Diagnostic Problem 3 Make sure that you show your work for the following problems. You are given two blue beetles and two black beetles. a) Cross 1: You mate (or cross) blue beetle #1 to black beetle f1 and obtain 220 black beetles in the F1 generation. What is the dominant phenotype? What is the recessive phenotype? What are the genotypes of the two parents and the offspring? Be sure to indicate which allele is associated with the dominant phenotype. b) Cross 2: You mate blue beetle #2 to black beetle #2 and obtain 55 blue beetles and 65 black beetles. What are the genotypes of the two parents and the offspring? c Cross 3: You mate two black offspring produced in Cross 2. What are the possible genotypes and phenotypes of the offspring? What are the expected proportions of these genotypes and phenotypes?

Solution

Cross 1:

Cross 2:

Cross 3:

Gametes

B

b

B

BB

Black

Bb

Black

b

Bb

Black

Bb

Blue

The genotypic ratio is 1 (BB) : 2 (Bb) : 1(bb).

The phenotypic ratio is 3 black beetles to 1 blue beetle.

Gametes	B	b
B	BB Black	Bb Black
b	Bb Black	Bb Blue