Two animals with dark fur are crossed multiple times, and, after analyzing all of their offspring, the following numbers emerge: 71 dark, 47 grey, 8 white. Explain: - what kind of inheritance is this? - show the genotypes of the parents - show the genotypes for all three phenotypes of the offspring (GENETICS QUESTION)
Answer
1. The inheritance is Incomplete dominance. In incomplete dominance, neither allele is dominant. Heterozygous condition have a blend of two traits and shows a third phenotype.
The cross is represented as follows. Assume Dark is heterozygous. D represent Grey and d represent white
Parents - Dark fur x Dark fur
Genotype - Dd x Dd
Gametes - D and d x D and d
Progeny -
Gametes | D | d |
D |
DD Grey |
Dd Dark |
d |
Dd Dark |
dd White |
The Phenotypic ratio = 1 Greyk : 2 Dark : 1 White
2. Genotype of Parents - Dd and Dd
3. Genotype of offspring= DD - Grey, Dd - Dark, dd - White
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