GENETICS AND EVOLUTION
INHERITANCE AND VARIATION
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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PP, Pp, pP, pp
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PP. pp. pp. PP
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Pp, Pp, Pp, Pp
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Pp, PP, pp, PP
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Detailed explanation-1: -In the given cross, the allele for purple flower “P” is dominant over the allele for while flower “p". So, the cross between PP (purple flowers) and pp (white flowers) plants will obtain all plants with purple progeny (Pp).
Detailed explanation-2: -When a “Pp” genotype plant is bred with a “pp” genotype plant, what percentage of the offspring is likely to have white flowers? 50% of the offspring are likely to have white flowers.
Detailed explanation-3: -A plant that has the genotype Pp is said to be heterozygous (HET uhr OH ZIE guhs). square for this cross is shown in Figure 2. All of the offspring have the same genotype: Pp. The dominant allele, P, in each genotype ensures that all of the offspring will be purple-flowered plants.
Detailed explanation-4: -P is dominant to p, so offspring with either the PP or Pp genotype will have the purple-flower phenotype.
Detailed explanation-5: -The F1 generation is 100% Pp. The F2 generation is 25% PP (homozygous dominant, purple flowers), 50% Pp (heterozygous, purple flowers), and 25% pp (homozygous recessive, white flowers). This is how the white characteristic reappears in the second generation. The phenotype is 3:1, purple to white.