Question at position 1 A pea is Yy and yellow. What is the phenotype?Yyyellow

Question

Question at position 1 A pea is Yy and yellow. What is the phenotype?Yyyellow

BlackTom AI · Accepted Answer

Restating the task: determine the phenotype for a pea plant that is Yy in genotype and yellow in appearance.
Option 1: 'Yy' — This option represents the genotype (the genetic makeup) rather than the visible trait. Since the question asks for phenotype, this is not the appropriate description of what the plant looks like.
Option 2: 'yellow' — This option correctly identifies the phenotype, which is the observable trait. In pea flowers, the dominant allele Y produces yellow kernels/colors, and a heterozygous genotype Yy still results in the yellow phenotype because the dominant allele masks the recessive one.
Why the first option is insufficient: genotype naming (letters like Yy) tells us what alleles are present, not how the plant appears. Without describing the outward trait, we haven’t answered the phenotype question.
Why the second option is correct: the phenotype is what we observe; since Y is dominant over y, any plant with at least one Y allele shows yellow coloration, including Yy and YY genotypes. Therefore, yellow accurately describes the phenotype for this plant.

Question at position 1 A pea is Yy and yellow. What is the phenotype?Yyyellow单项选择题

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