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Movie: × shein x C Secure https://session. nasteringgenetics.com/mct itemver?assignmen Problem ID 5578 045 Epistasis Homework- (Homework 3-Part 2) Question5 5of 5 in cattle, coats may be solid white, solid black, or black-and-white spotted. When After many Fix Fi matings, the following ratio was observed in the Fa germabon true-breeding solid whites are mated with true-breeding solid blacks, the Fi generation consists of all solid white indviduais 12/16 solid white 3/16 black-and-white spotted 1/16 solid black Explain the mode of inheritance governing coat color by determining how many gene pairs are involved and which genotypes yield which phenotypes Part A How many gene pairs are involved in the inheritance of cattle coat color? Correct PartB What type of genetic ineraction is observed in this data?

Explanation / Answer

Part A
The number of gene pairs that are involved in the inheritance of cattle coat colour are:
2 - this is because the observed phenotypes are observed out of a potential denominator of 16. Since each gene presence confers 4 options. Hence a presence of 2 genes would lead to this 4*4=16 output style.

Part B
Since this dihybrid cross does not show the usual 9:3:3:1 phenotypic output, and the AaBB, AaBb, & AabB forms seem to show the same phenotype as an AA, Aa, or aA condition, we can safely say that gene A must be epistatic to gene B, which means that in the event that gene A is homozygously or heterozygously dominant, it will mask the phenotype shown by B, irrespective of B's state.

Part C
Assigning the appropriate genotypes to the respective phenotypes (while assuming that A is epistatic to B):
Solid white: AABB, AABb, AAbb, AaBB, AaBb, Aabb
Black-and-white spotted: aaBB, aaBb
Solid black: aabb

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