Question

A true-breeding black hamster is crossed to a true-breeding white hamster. The F1 generation are all tan. The F1 hamsters are crossed and the resulting pups are as follows: 68 black, 133 tan and 59 white. What inheritance pattern do you see for fur color?

- Additive Gene interaction
- Dominant Epistasis
- Reciprocal Recessive Epistasis
- IncompleteDominance

Answer 1

The inheritance pattern for fur color in the described cross of hamsters is Incomplete Dominance, explaining the intermediate tan F1 phenotype and the 1:2:1 phenotypic ratio of black:tan:white in the F2 generation.

Step-by-step explanation:

When considering the given cross between a true-breeding black hamster and a true-breeding white hamster which results in tan F1 offspring, and a subsequent F1 cross producing black, tan, and white pups in non-mendelian ratios, the inheritance pattern observed is most likely Incomplete Dominance. This conclusion is drawn from the intermediate tan phenotype in the F1 generation, and the appearance of the original parental phenotypes in a ratio that doesn't match simple dominance or recessive patterns. When true-breeding (homozygous) individuals show co-existence in the F1 offspring (heterozygous) that is different from both parents, it suggests incomplete dominance. Moreover, the ratio of the F2 offspring colors is close to 1:2:1, which suggests the tan color is an intermediate form.

for the inheritance pattern of fur color in the hamsters described is Incomplete Dominance. This explains the 1:2:1 phenotypic ratio of black:tan:white in the F2 generation, which represents the inheritance of a trait that is neither completely dominant nor completely recessive, leading to a third, intermediate phenotype.