25. A trait is being followed in the exquisite rare animal Sabalis corriganis. T

Question

25. A trait is being followed in the exquisite rare animal Sabalis corriganis. The recessive ded genotype will exhibit a phenotype termed droopy lips, D_will exhibit normal lips. A Sabalis with droopy lips is crossed with a homozygous normal lipped Sabalis. Their offspring were then crossed. What are the genotypes of the parental generation? What are the genotype and the phenotype of the F1 generation? What is the genotypic ratio in the F2 generation? What is the phenotypic ratio in the F2 generation a. b. c. d.

Explanation / Answer

Genotype of droopy lipis : dd

Genotype of normal lips : DD

a) Genotypes of Parents: dd X DD

b) F1: Dd ; Dd

c) F2:

DD

(normal lips)

Dd

(normal lips)

Dd

(normal lips)

dd

droopy lips

Out of 4 offspring produce 1DD: 2Dd: 1dd. The genotype ratio is 1:2:1

d) Out of 4 offspring produced 3 contain normal lips and 1 contains droopy lips. The genotype ratio is 3 (normal): 1 (droopy).

male/ female D d D

DD

(normal lips)

Dd

(normal lips)

d

Dd

(normal lips)

dd

droopy lips

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