A pureline plant of genotype Ab/Ab is crossed to another pureline plant aB/aB. The F1 hybrid is testcrossed. If both genes are closely linked with no crossover, what Fraction of the progeny of this testcross will be double homozygous recessive? O more than 25% 0% 25% Oless than 25% but higher than 0%

A pureline plant of genotype Ab/Ab is crossed to another pureline plant aB/aB. The F1 hybrid is testcrossed. If both genes are closely linked with no crossover, what Fraction of the progeny of this testcross will be double homozygous recessive? O more than 25% 0% 25% Oless than 25% but higher than 0%

Concepts of Biology

1st Edition

ISBN:9781938168116

Author:Samantha Fowler, Rebecca Roush, James Wise

Publisher:Samantha Fowler, Rebecca Roush, James Wise

Chapter8: Patterns Of Inheritance

Section: Chapter Questions

Problem 2ACQ: Figure 8.10 In pea plants, purple flowers (P) are dominant to white (p), and yellow peas (Y) are...

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In sweet pea plant, an allele for purple flowers (P) is dominant when paired with a recessive allele for red flowers (p). An allele for long pollen grains (L) is dominant when paired with a recessive allele for round pollen grain (l). Bateson and Punnett crossed a plant having purple flowers/long pollen grains with one having white/flowers/round pollen grains. All F1 offspring had purple flowers and long pollen grains. Among the F2 generation, the researchers observed the following phenotypes: 296 purple flowers/long pollen grains 19 purple flowers/round pollen grains 27 red flowers/long pollen grains 85 red flowers/round pollen grains What is the best explanation for these results?
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Some sweet-pea plants have purple flowers and others have white flowers. A homozygous variety of sweet pea that has purple flowers is crossed with a homozygous variety that has white flowers. All the F1have purple flowers. When these F1 self-fertilize, the F2 appear in a ratio of 916 purple to 716 white. a. Give genotypes for the purple and white flowers in these crosses.
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