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In Chickens, Comb Shape Is Determined by Genes at Two

question 24

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 pea produces 20 walnut offspring.

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Definitions:

Correspondence Theory

A theory of truth stating that the truth or falsehood of a statement is determined by how it relates to the world and whether it accurately describes (corresponds with) that world.

Objective Truth

Truth independent of our personal opinions and demonstrably true to anyone (who is in the proper position to observe, who has the right testing equipment, and so on).

Justified True Belief

A traditional model in epistemology that defines knowledge as a belief that is both true and justified by sufficient evidence or reasoning.

Knowledge

Knowledge or proficiency gained from direct experience or instruction; insight into a subject via its study or application in a practical or theoretical manner.