phenotypic ratio would result?

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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In the early 20th century, the following information was discovered about comb
shape in chickens. If a chicken had a dominant R allele and was homozygous
recessive for the P gene, then be comb was rose-shaped. If a chicken had a
dominant P allele and was homozygous recessive for the R gene, then the comb
was pea-shaped. However, if a chicken had both a dominant P allele and a
dominant Rallele, then the comb was walnut-shaped. Homozygous recessive
alleles for both genes resulted in the single comb shape. If a heterozygous rose-
shaped chicken was crossed with a heterozygous pea-shaped chicken, what
phenotypic ratio would result?
O 3 walnut: 1 single
O 1 pea: 1 rose
9 pea: 3 rose: 3 walnut: 1 single
O 1 pea: 1 rose: 1 walnut: 1 single
Transcribed Image Text:In the early 20th century, the following information was discovered about comb shape in chickens. If a chicken had a dominant R allele and was homozygous recessive for the P gene, then be comb was rose-shaped. If a chicken had a dominant P allele and was homozygous recessive for the R gene, then the comb was pea-shaped. However, if a chicken had both a dominant P allele and a dominant Rallele, then the comb was walnut-shaped. Homozygous recessive alleles for both genes resulted in the single comb shape. If a heterozygous rose- shaped chicken was crossed with a heterozygous pea-shaped chicken, what phenotypic ratio would result? O 3 walnut: 1 single O 1 pea: 1 rose 9 pea: 3 rose: 3 walnut: 1 single O 1 pea: 1 rose: 1 walnut: 1 single
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