In peas, the allele for yellow seeds (Y) is dominant to the allele for green seeds (y). What would be the genotype and phenotype ratios of offspring from a cross between Yy (heterozygous) and yy (homozygous recessive) individuals?

a. Genotype: ½ Yy : ½ yy; Phenotype: ½ yellow : ½ green

b. Genotype: all Yy; Phenotype: all yellow

c. Genotype: ½ Yy : ½ yy; Phenotype: all yellow

d. Genotype: all yy; Phenotype: all green

Question

Biology

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26 April, 14:06

In peas, the allele for yellow seeds (Y) is dominant to the allele for green seeds (y). What would be the genotype and phenotype ratios of offspring from a cross between Yy (heterozygous) and yy (homozygous recessive) individuals?

a. Genotype: ½ Yy : ½ yy; Phenotype: ½ yellow : ½ green

b. Genotype: all Yy; Phenotype: all yellow

c. Genotype: ½ Yy : ½ yy; Phenotype: all yellow

d. Genotype: all yy; Phenotype: all green

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Answers (1)

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Nia Conway · Answer 1

Answer: A. Genotype: 1/2 Yy; 1/2 yy. Phenotype: 1/2 Yellow; 1/2 Green.

Explanation: The answer lies in Punnett's Square. A visual representation of Mendelian inheritance. Dominant genes always express when an organism presents them. Recessive genes express when both alleles contain the recessive gene. A heterozygote contains different alleles for the same gene (Yy). A homozygote contains the same alleles for the same gene (YY/yy), which can be a Dominant (YY) or Recessive (yy) Homozygote.

y | y

Y Yy | Yy

y yy | yy