Campbell Biology in Focus (2nd Edition)
Campbell Biology in Focus (2nd Edition)
2nd Edition
ISBN: 9780321962751
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Jane B. Reece
Publisher: PEARSON
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Chapter 11, Problem 1TYU

DRAW IT Two pea plants heterozygous for the characters of pod color and pod shape are crossed. Draw a Punnett square to determine the phenotypic ratios of the offspring.

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Summary Introduction

To draw:

The Punnett square to determine the phenotypic ratios of the offspring.

Introduction:

Punnett square is a tabular representation of the cross between the two species. It helps in determining the outcome of a particular cross and can help in estimating the genotypic as well as the phenotypic ratio.

Explanation of Solution

Pictorial representation: Punnett square depicting the dihybrid cross between the two pea plants are as follows:

Parental traits: Pod Colour: Dominant yellow (Y); recessive green (y)

        Pod Shape: Dominant round (R); recessive wrinkled (r)

Campbell Biology in Focus (2nd Edition), Chapter 11, Problem 1TYU

Fig.: 1 Punnett square depicting the dihybrid cross between the two pea plants of different characters.

The Punnett square is the diagrammatic representation to predict the outcome (phenotype and genotype) of the breeding experiment. In the given cross, pea plants that have two distinct characters are chosen, where one has round and yellow pods and the other one has wrinkled and green pods.

The cross provides a phenotypic ratio of 9:3:3:1 in a total of 16 outcomes. This means that there will be 4 different types of outcomes, namely round and yellow, round and green, wrinkled and yellow, and wrinkled and green. The genotypic ratio of the cross is 1:2:1:2:4:2:1:2:1, which means that there are 9 different types of genotype in this dihybrid cross.

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Figure shows a dihybrid cross but it can be analyzed as a monohybrid cross of just smooth seed coat (S) and wrinkled seed coat (s) with complete dominance that should show a 1:2:1 ratio. Examine Figure and see if you can find these results. Likewise, it can be analyzed as a monohybrid cross of yellow seed coat versus green. Can you find these in the expected ratio?
In certain plants, tall (T) is dominant to short (t). If a heterozygous plant is crossed with a homozygous short plant, what is the probability that the offspring will be short?  Show the punnett square please.
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