In Chickens, Comb Shape Is Determined by Genes at Two

question 17

Multiple Choice

In chickens, comb shape is determined by genes at two loci (R, r and P, p) . A walnut comb is produced when at least one dominant gene R is present at one locus and at least one dominant gene P is present at a second locus (genotype R_ P_) . A rose comb is produced when at least one dominant gene is present at the first locus and two recessive genes are present at the second locus (genotype R_ pp) . A pea comb is produced when two recessive genes are present at the first locus and at least one dominant gene is present at the second (genotype rr P_) . If two recessive genes are present at the first and the second locus (rr pp) , a single comb is produced.
- Give genotypes for comb shape of the parents in the following cross: Rose crossed with single produces 31 rose offspring.

• A) RR PP × rr pp
• B) RR pp × rr pp
• C) Rr PP × rr pp
• D) Rr Pp × rr pp
• E) Rr pp × rr pp

---

Definitions:

Sales

The activity or business of selling products or services.

Income by Customer

A report or metric that breaks down the total income received by the business, attributing it to each individual customer.

Summary Report

A concise document that presents the key findings, results, or data from a larger set of information or analysis.

Reports Center

A feature in accounting software that centralizes access to various financial reports and analyses.