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In sweet pea plants, an allele for purple flowers. (P) is dominanl when paired with a recessive allele for red flowers (p) . An allele for Jang pollen grains (L) is dominant when paired with a recessive allele for round pollen grains ( L ). Bateson and Punnett crossed a plant having purple flowers and long pollen grains with one having white flowers and round pollen grains. All F 1 offspring have purple flowers and long pollen grains. Among the F 2 generation, the researchers observed the following phenotypes: 296 purple flowers/long pollen grains 19 purple /lower/ 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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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332

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Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 13, Problem 8GP
Textbook Problem
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In sweet pea plants, an allele for purple flowers. (P) is dominanl when paired with a recessive allele for red flowers (p). An allele for Jang pollen grains (L) is dominant when paired with a recessive allele for round pollen grains (L). Bateson and Punnett crossed a plant having purple flowers and long pollen grains with one having white flowers and round pollen grains. All F1 offspring have purple flowers and long pollen grains. Among the F2 generation, the researchers observed the following phenotypes:

296 purple flowers/long pollen grains

19 purple /lower/ round pollen grains

27 red flowers/long pollen grains

85 red flowers/round pollen grains

What is the best explanation for these results?

Summary Introduction

To explain: The results obtained from an experiment where purple long pollen grains were crossed with red round pollen grains.

Concept introduction: Independent assortment of alleles is one of the laws proposed by Gregor Johann Mendel, a geneticist. Mendel proposed the law of independent assortment based on the results of dihybrid cross. Independent assortment is with regard to the genes of the loci. Locus refers to the location of the gene in the chromosome. In the homologous chromosome, two genes are present in two different locus. These two genes separate and enter two different gametes independent of the other.  This process is called as law of independent assortment. During meiosis, the two copies of the same gene in the locus separate and enter gametes, so that the offspring acquires one copy of gene from each parent.

Dihybrid cross is where two dominant alleles are crossed with two recessive alleles that is cross between two observable traits in the same organism. The two observable traits can be from the same or different organism.

Explanation of Solution

The experiment was performed in sweet pea plants. The following alleles were considered for the study.

PP- Purple flowers. Dominant.

pp- Red flowers. Recessive.

LL- Long pollen grain. Dominant.

ll - Round pollen grain. Recessive.

Parents were PPLL (Purple flowers and long pollen grain) and ppll (white flowers and round pollen grains).

The F1 generation obtained had purple flowers and long pollen grains (PpLl)...

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