Question

In a plant species, if the b1 allele (blue flowers) and the b2 allele (white flowers) are incompletely dominant (b1b2 is light blue), what offspring ratio is expected in a cross between heterozygotes?

Answer 1

This is a case of incomplete dominance, In a cross between heterozygotes b1b2 the ratio will be 1:2:1.

• When both alleles of a gene are only partially expressed at a locus, it is known as incomplete dominance.
• This sort of gene interaction frequently produces an intermediate or distinct phenotype. Additionally called partial dominance.
• Pink blossoms of the four o'clock flower (Mirabilis Jalapa) and physical traits in people, such as hair color, hand sizes, and height, are instances of incomplete dominance.
• When the two alleles combine to create a third phenotype that differs from both of the parents, this is known as incomplete dominance.
• The standard illustration is when a red flower and a white flower are combined.

the cross for two individuals with genotype b1b2 is as follows:

b1b2    X    b1b2   (parent)

b1b1, b1b2, b1b2, b2b2 (offspring)

thus the ratio will be 1:2:1 (blue: light blue: white)

learn more about  incomplete dominance here: brainly.com/question/14080068

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