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How do you do a dihybrid cross?

tokem97

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13 years ago

How do you do a dihybrid cross?

How do you do a dihybrid cross?

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smilejoni

wrote...

#1

13 years ago

In a dihybrid cross, 2 of the same genes are crossed per parent.
Draw a square and split it into 4 smaller squares. Then, write the 2 genes above the upper squares (one per square) and the other two on the left side in the same fashion. Then, just put them in the squares below or to the right of them and you'll find the genotype, or the genetic makeup. If you combine BB with bb, you'll always get 4 Bb. If you combine Bb with Bb you'll get 1 BB, 2 Bb, and 1 bb. If BB with Bb, 2 Bb and 2 BB. If bb with Bb, 2 bb and 2 Bb. good luck

smilejoni

wrote...

#2

13 years ago

A dihybrid cross is a cross where you are paying attention to two genes. Let's say the genes are a and b, and capital letters represent dominant alleles. In a dihybrid cross you would cross two individuals who are heterozygous at both genes (AaBb x AaBb). The phenotype ratio of the offspring would be 9:3:3:1.

toku

wrote...

#3

13 years ago

Type dihybrid cross in the "search for questions" box of Yahoo Answers and find a question like this that was answered a week or so ago.

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