Comb shape in chickens also involves the interaction of two genes, but the F2 generation shows a typical 9:3:3:1 Mendelian ratio. How does this work?

What will be an ideal response?


A dominant allele present in one gene in combination with the homozygous recessive state in the other gene produces one of two phenotypes (rose or pea). Both dominant alleles present produce a third phenotype (walnut), and both homozygous recessives produce a fourth phenotype (single). The ratio is 9 walnut : 3 rose : 3 pea : 1 single.

Biology & Microbiology

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Knowledge of an organism's genome sequence yields important clues to how an organism functions and its evolutionary history

Indicate whether the statement is true or false.

Biology & Microbiology

The shape of a virus is determined by

A. its DNA. B. its RNA. C. its envelope. D. its host. E. its coat protein organization.

Biology & Microbiology

What antibody class is the most common class of antibody produced in the primary response to an antigen?

A) IgM B) IgE C) IgG D) IgD E) IgA

Biology & Microbiology

The lacZ gene encodes

A. ampicillin-resistance protein. B. aromatase. C. glucose dehydrogenase. D. lactose. E. ?-galactosidase.

Biology & Microbiology