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Evolution 2nd Edition

Evolution (2nd Edition)

Book Edition2nd Edition
Author(s)Bergstrom, Dugatkin
ISBN9780393937930
PublisherW. W. Norton
SubjectBiology
Section 6.1: Mendel's Law
KEY CONCEPT QUESTION
Section 6.2: Transmission Genetics
KEY CONCEPT QUESTION
Section 6.3: Variation and Mutation
KEY CONCEPT QUESTION

Chapter 6, Section 6.1, KEY CONCEPT QUESTION, Exercise 6.1

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Explanation

The law of independent assortment given by Scientist M can be defined as the independent sorting of two or more alleles into different gametes without influencing one another. In selected plant, the seven traits of study were independent of each other and not linked. As a result, the Law of Independent Assortment could be studied without any hurdles.

If the selected plant [or any other plant] had linked genes, then few genes could have influenced the distribution of other genes. If an allele of gene A is linked to an allele of gene B, then during the assortment of the genes into gametes, alleles of A and B genes would be distributed together as a single unit. In such a case, Scientist M would have observed some other ratio of offspring phenotypes. For this reason, it might not be possible for him to deduce the law.

Verified Answer

Scientist M was fortunate to choose about the selection of plant for his studies. The selected plant has a short life span, and has discreet features, which are not linked with each other. This helped him to study all the traits individually as well as in combinations [dihybrids and trihybrids], and provided a proper mathematical calculation for the expectancy of the progeny trait, along with defining the occurrence of each trait as an independent feature.

If the test plant chosen by Scientist M had linked characters, study of independent assortment would not have been possible as two or more genes [or traits] would have been linked to each other, and they would not have sorted independently to the progeny plants.

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