EXPLAIN your ANSWER for Rating no explanation, no rating Item 6 The dihybrid AaB

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Item 6 The dihybrid AaBb x AaBb cross was carried out and resulted in a 9:3:4 progeny phenotypic ratio. If some of those dihybnd (AaBb) individuals were testcrossed.. Part A what phenotypic ratio would you expect? Enter your answer like this example: 9to3to3to1. Do not include any genotypes/phenotypes with your answer. Only enter the numbers in the ratio, separated by the word, to, with no spaces. The order of the phenotypes represented by your numbers should match the order of those represented by the given epistasis ratio (9:3:4).

Explanation / Answer

The phenotypic ratios of the test cross would be 9:3:3:1.

AaBb X AaBb

In the above given ratio 9:3:4 epistasis is observed as the recessive phenotype is merged with the heterozygous phenotype as it could resulted as 9:3: 4 (3+1).

male/female AB Ab aB ab AB AABB AABb AaBB AaBb Ab AABb AAbb AaBb AAbb aB AaBB AaBb aaBB aaBb ab AaBb Aabb aaBb aabb

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