Question

What is the ratio of a dihybrid cross?

Answer 1

Dihybrid cross:

1. A dihybrid cross is a cross between two distinct genes that differ in two recognized features.
2. This hybrid is made up of two organisms that are both heterozygous.
3. Gregor Mendel came up with the concept of a dihybrid cross after observing pea plants that had seeds either yellow or green, spherical or wrinkled.
4. Each attribute is represented by a separate pair of alleles in a dihybrid cross.
5. One parent has a homozygous dominant allele, whereas the other has a homozygous recessive allele.
6. The children generated by the crosses in the F1 generation are all heterozygous for certain characteristics.

The ratio of dihybrid cross:

1. The phenotypic ratio of the dihybrid cross in the standard Mendel experiment is 9:3:3:1.
2. The two allelic pairings assort separately into the gametes in this case.
3. A dihybrid cross has a genotypic ratio of 1:2:2:4:1:2:1:2:1.