In a genetic cross, if the ratio of phenotypes in the offspring is 9:3:3:1, what

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Question: In a genetic cross, if the ratio of phenotypes in the offspring is 9:3:3:1, what type of cross was performed?

Options:

Correct Answer: Dihybrid

Solution:

A 9:3:3:1 ratio indicates a dihybrid cross involving two traits.

In a genetic cross, if the ratio of phenotypes in the offspring is 9:3:3:1, what type of cross was performed?

In a genetic cross, if the ratio of phenotypes in the offspring is 9:3:3:1, what type of cross was performed?

Step 1: Understand what a phenotype is. A phenotype is the observable traits of an organism, like color or shape.
Step 2: Know what a genetic cross is. A genetic cross is when two organisms are bred to see how their traits combine in the offspring.
Step 3: Learn about the ratio 9:3:3:1. This ratio shows how many offspring have different combinations of traits.
Step 4: Recognize that a 9:3:3:1 ratio comes from a dihybrid cross, which involves two different traits.
Step 5: Remember that in a dihybrid cross, each parent contributes two alleles for each trait, leading to four possible combinations in the offspring.

Dihybrid Cross – A genetic cross between two individuals that differ in two traits, resulting in a phenotypic ratio of 9:3:3:1 in the offspring.