Colored aleurone in the kernels of corn is due to the dominant allele R. The recessive allele r, when homozygous, produces colorless aleurone. The plant color (not the kernel color) is controlled by another gene with two alleles, Y and y. The dominant Y allele results in green color, whereas the homozygous presence of the recessive y allele causes the plant to appear yellow. In a testcross between a plant of unknown genotype and phenotype and a plant that is homozygous recessive for both traits, the following progeny were obtained: colored, green 88 colored, yellow 12 colorless, green 8 colorless, yellow 92 Explain how these results were obtained by determining the exact genotype and phenotype of the unknown plant, including the precise arrangement of the alleles on the homologs.
Colored aleurone in the kernels of corn is due to the dominant
allele R. The recessive allele r, when homozygous, produces colorless
aleurone. The plant color (not the kernel color) is controlled
by another gene with two alleles, Y and y. The dominant Y allele
results in green color, whereas the homozygous presence of the
recessive y allele causes the plant to appear yellow. In a testcross
between a plant of unknown genotype and
were obtained:
colored, green 88
colored, yellow 12
colorless, green 8
colorless, yellow 92
Explain how these results were obtained by determining the exact
genotype and phenotype of the unknown plant, including the precise
arrangement of the alleles on the homologs.
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