Question

question 9
1 pts
which of the following statements correctly describes dihybrid crosses?
they are crosses involving two genes with two alleles each.
they are crosses involving one gene with two alleles.
they are crosses involving two genes that control one trait.
they are crosses involving one gene with four alleles.

Explanation:

A dihybrid cross is a cross between two individuals that are both heterozygous for two different genes. Each gene has two alleles. For example, in pea plants, a cross involving the genes for seed color (yellow - Y, green - y) and seed shape (round - R, wrinkled - r) is a dihybrid cross. The cross involves two genes (color and shape), and each gene has two alleles.

• The option "They are crosses involving one gene with two alleles" is incorrect because it is a monohybrid cross.
• The option "They are crosses involving two genes that control one trait" is incorrect. Usually, each gene in a dihybrid cross controls a different trait.
• The option "They are crosses involving one gene with four alleles" is incorrect as it does not fit the definition of a dihybrid cross.

Answer:

They are crosses involving two genes with two alleles each.