Loose-leaf Version for Biology How Life Works & LaunchPad  (Twenty-Four Month Access)
Loose-leaf Version for Biology How Life Works & LaunchPad (Twenty-Four Month Access)
2nd Edition
ISBN: 9781319067809
Author: James Morris, Daniel Hartl, Andrew Knoll, Robert Lue, Melissa Michael, Andrew Berry, Andrew Biewener, Brian Farrell, N. Michele Holbrook
Publisher: W. H. Freeman
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Chapter 16, Problem 1QC
Summary Introduction

To describe:

The genotypes and phenotypes for Mendel’s true-breeding parent plants.

Concept introduction:

Mendel conducted his experiments on pea plant. He considered inheritance of seven traits in pea plants (Pisum sativum). Mendel began with the pure-breeding pea plants because the offspring always produced progeny with the same characteristics as that of the parent plant.

Expert Solution & Answer
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Explanation of Solution

The seven traits considered by Mendel in pea plant and the phenotype and genotype of each trait are given below:

  • Pea shape (round or wrinkled): The phenotype for true breeding performed by Mendel is round pea shape then genotype will be RR. The phenotype for true breeding performed by Mendel is wrinkled pea shape then genotype will be rr.
  • Pea color (yellow or green): The phenotype for true breeding performed by Mendel is yellow pea color then genotype will be YY. The phenotype for true breeding performed by Mendel is green pea color then genotype will be yy.
  • Flower color (purple or white): The phenotype for true breeding performed by Mendel is purple flower color then genotype will be PP. The phenotype for true breeding performed by Mendel is white flower color then genotype will be pp.
  • Flower position (terminal or axial): The phenotype for true breeding performed by Mendel is axial flower position then genotype will be AA. The phenotype for true breeding performed by Mendel is terminal flower position then genotype will be aa.
  • Plant height (tall or short): The phenotype for true breeding performed by Mendel is tall plant height then genotype will be TT. The phenotype for true breeding performed by Mendel is dwarf plant height then genotype will be tt.
  • Pod shape (inflated or constricted): The phenotype for true breeding performed by Mendel is inflated pod shape then genotype will be II. The phenotype for true breeding performed by Mendel is constricted pod shape then genotype will be ii.
  • Pod color (yellow or green): The phenotype for true breeding performed by Mendel is green pod color then genotype will be GG. The phenotype for true breeding performed by Mendel is yellow pod color then genotype will be gg.
Conclusion

True breeding is described for those organisms that produce offspring identical to them if they are allowed to self-pollinate.

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How to solve genetics probability problems; Author: Shomu's Biology;https://www.youtube.com/watch?v=R0yjfb1ooUs;License: Standard YouTube License, CC-BY
Beyond Mendelian Genetics: Complex Patterns of Inheritance; Author: Professor Dave Explains;https://www.youtube.com/watch?v=-EmvmBuK-B8;License: Standard YouTube License, CC-BY