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Sunflowers with flowers 10 cm in diameter are crossed with a plant that has 20-cm flowers. The F1 plants have flowers 15 cm in diameter. In the F2 generation, 4 flowers are 10 cm in diameter and 4 are 20 cm in diameter. Between these are 5 phenotypic classes with diameters intermediate to those at the extremes. a. Assuming that the alleles that contribute to flower diameter act additively, how many genes control flower size in this strain of sunflowers? b. How much does each additive allele contribute to flower diameter? c. What size flower makes up the largest phenotypic class?

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Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052

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Section
BuyFindarrow_forward

Human Heredity: Principles and Iss...

11th Edition
Michael Cummings
Publisher: Cengage Learning
ISBN: 9781305251052
Chapter 5, Problem 7QP
Textbook Problem
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Sunflowers with flowers 10 cm in diameter are crossed with a plant that has 20-cm flowers. The F1 plants have flowers 15 cm in diameter. In the F2 generation, 4 flowers are 10 cm in diameter and 4 are 20 cm in diameter. Between these are 5 phenotypic classes with diameters intermediate to those at the extremes.

  1. a. Assuming that the alleles that contribute to flower diameter act additively, how many genes control flower size in this strain of sunflowers?
  2. b. How much does each additive allele contribute to flower diameter?
  3. c. What size flower makes up the largest phenotypic class?

a.

Summary Introduction

To determine: The number of genes that control the size of the flower when the alleles are contributing to flower diameter act additively.

Introduction: The sunflowers, having flowers of 10cm diameter, are crossed with another plant, having flowers of 20cm diameter. The F1 plants have flowers of 15cm diameter. The F2 generation had 4 flowers of 10cm diameter and 4 flowers of 20cm diameter. There are 5 phenotypic classes with diameters intermediate between the two extremes

Explanation of Solution

The case has two extremes-10cm and the 20cm diameter with 5 intermediate diameters between 10cm and 20cm. There are a total of 7 phenotypic classes. The 10cm flower has all the recessive alleles and the presence of each dominant allele adds some diameter to the flower. The first intermediate would have one dominant allele, the second intermediate would have two dominant...

b.

Summary Introduction

To determine: The contribution of each additive allele to the diameter of the flower.

Introduction: The sunflowers, having flowers of 10cm diameter, are crossed with another plant, having flowers of 20cm diameter. The F1 plants have flowers of 15cm diameter. The F2 generation had 4 flowers of 10cm diameter and 4 flowers of 20cm diameter. There are 5 phenotypic classes with diameters intermediate between the two extremes.

c.

Summary Introduction

To determine: The size of the flower which makes up the largest phenotypic class.

Introduction: The sunflowers, having flowers of 10cm diameter, are crossed with another plant, having flowers of 20cm diameter. The F1 plants have flowers of 15cm diameter. The F2 generation had 4 flowers of 10cm diameter and 4 flowers of 20cm diameter. There are 5 phenotypic classes with diameters intermediate between the two extremes.

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