Genetics | Dihybrid Cross (Example 2)

The video tutorial explains the process of performing a dihybrid cross, focusing on genes A and B, which code for height and speed, respectively. Both maternal and paternal genotypes are heterozygous for these genes. The tutorial covers setting up the dihybrid cross, filling in the 16 cells, and calculating both genotypic and phenotypic ratios. It emphasizes the importance of correctly setting up the cross and provides a shortcut for memorizing the phenotypic ratio of 9:3:3:1 when crossing two heterozygotes.

What is a dihybrid cross and how does it differ from a monohybrid cross?

Describe the genotypes of the maternal and paternal organisms in the dihybrid cross example.

How many cells are there in a Punnett square for a dihybrid cross?

What is the significance of setting up the dihybrid cross correctly?

Explain how to fill in the cells of a dihybrid cross.

What is the genotypic ratio obtained from the dihybrid cross example?

How does the phenotypic ratio of a dihybrid cross compare to that of a monohybrid cross?

Define the phenotypic ratio and how it is determined in a dihybrid cross.

What are the phenotypes associated with the alleles A and B in the example?

What is the memorized phenotypic ratio when crossing two heterozygotes for two genes?