Why are there no offspring with green seeds in this study?
In peas, the color of the seed and the color of the seed pod are independent genes. For the seed, the yellow color is dominant and shown as Y. The green color is recessive and shown as y. For the seed pod, the green color is dominant and shown as G. The yellow pod color is recessive and shown as g. The diagram shows a Punnett square analysis of a cross of two parents with different combinations of these traits.
Parent 2 is homozygous for the yellow pod color (gg). These yellow alleles combine with the yellow (g) allele of parent 1 to turn the seeds yellow.
Parent 1 is heterozygous for the seed pod color. The yellow allele (g) combines with the two other yellow alleles (Y) to outnumber the green allele.
Parent 2 is homozygous for the recessive yellow seed allele y. The two recessive alleles combine to produce the dominant yellow color.
Parent 1 is homozygous for the dominant Y allele. These alleles are in all of the possible gametes from this parent, so a dominant Y allele will be transmitted to each offspring, masking the recessive green color.
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