EBK CONCEPTS OF GENETICS
EBK CONCEPTS OF GENETICS
12th Edition
ISBN: 9780134818979
Author: Killian
Publisher: YUZU
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Chapter 25, Problem 21ESP

A 3-inch plant was crossed with a 15-inch plant, and all F1 plants were 9 inches. The F2 plants exhibited a “normal distribution,” with heights of 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, and 15 inches.

  1. (a) What ratio will constitute the “normal distribution” in the F2?
  2. (b) What will be the outcome if the F1 plants are testcrossed with plants that are homozygous for all nonadditive alleles?
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Two pure-breeding lines of petunia plants are crossed. Line 1 plants grow to a height of 54 cm, and Line 2 plants grow to a height of 18 cm. Petunia plant height is controlled by three genes, A, B and C. Line 1 has the genotype A₁A₁B₁B₁C₁C₁, and line 2 has the genotype A2A2B₂B₂C₂C₂. Assume that genotype alone determines plant height under ideal growth conditions and that the alleles of the three genes are additive. If the F1 plants are self crossed, what is the expected proportion of F2 plants with the genotype A₁A₁B₁B₁C₁C₁ 1/8 1/32 1/16 1/4 1/64

Chapter 25 Solutions

EBK CONCEPTS OF GENETICS

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