Darwin’s insights into the role of selection in evolution began with close observations of the enormous phenotypic variation among different pure-breeding varieties of domesticated pigeons. Study of varieties found in any domesticated species could provide similar insights. For comparison, we’d like to know what degree of phenotypic variation might be expected among the domesticated peas available to Mendel.d. In the F10 generation from the above hybrid, how many phenotypically distinguishable pure-breeding varieties could be observed? [part c was 2187]e. [Note: this one requires use of combinations; it is also a significantly more difficult problem.] Mendel began his work with pairs of varieties from the breeders that differed from each other in just one trait (corresponding to one gene difference, as we now know) out of the 7 traits he studied. These pairs could be obtained by self-pollinating an individual from an advanced generation that was pure-breeding for 6 of the traits but heterozygous for the 7th. i. What is the probability of finding an example plant in the F10 generation? [Hint: the probability that 6 genes are homozygous after 10 generations times the probability that the 7th is heterozygous at the same generation times the 7 different genes that could be the heterozygous one.] ii. What is the probability of finding an example plant in the F4 generation? [Note: this probability is higher than that for the F10 generation or the F3 generation. What qualitative reason might there be? Hint: consider that the proportion of heterozygotes decreases each generation …]

Answered: Mendel began his work with pairs of…

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

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Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

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Darwin’s insights into the role of selection in evolution began with close observations of the enormous phenotypic variation among different pure-breeding varieties of domesticated pigeons. Study of varieties found in any domesticated species could provide similar insights. For comparison, we’d like to know what degree of phenotypic variation might be expected among the domesticated peas available to Mendel.
d. In the F10 generation from the above hybrid, how many phenotypically distinguishable pure-breeding varieties could be observed? [part c was 2187]
e. [Note: this one requires use of combinations; it is also a significantly more difficult problem.] Mendel began his work with pairs of varieties from the breeders that differed from each other in just one trait (corresponding to one gene difference, as we now know) out of the 7 traits he studied. These pairs could be obtained by self-pollinating an individual from an advanced generation that was pure-breeding for 6 of the traits but heterozygous for the 7^th.
i. What is the probability of finding an example plant in the F10 generation? [Hint: the probability that 6 genes are homozygous after 10 generations times the probability that the 7^th is heterozygous at the same generation times the 7 different genes that could be the heterozygous one.]
ii. What is the probability of finding an example plant in the F4 generation? [Note: this probability is higher than that for the F10 generation or the F3 generation. What qualitative reason might there be? Hint: consider that the proportion of heterozygotes decreases each generation …]

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. Gregor Johann Mendel is known as the father of genetics. He worked on pea plants for about Seven years. He chose pea plants because of the various reasons which include the following:

Pea plants have a short life span
They were easy to grow
Pea plants show several observable characteristics.

The seven contrasting characters that were chosen by Mendel for his experiment on pea plants include:

Flower color (purple or white),
Flower position (axil or terminal),
Stem length (long or short),
Seed shape (round or wrinkled),
Seed color (yellow or green),
Pod shape (inflated or constricted),
Pod color (yellow or green).

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