Campbell Biology in Focus
Campbell Biology in Focus
3rd Edition
ISBN: 9780134710679
Author: Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky, Rebecca Orr
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, 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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Students have asked these similar questions
DRAW IT A pea plant heterozygous for inflated pods (Ii) iscrossed with a plant homozygous for constricted pods (ii).Draw a Punnett square for this cross to predict genotypic andphenotypic ratios. Assume that pollen comes from the ii plant
A cross is made between a pea plant that has constricted pods (arecessive trait; smooth is dominant) and is heterozygous for seedcolor (yellow is dominant to green) and a plant that is heterozygous for both pod texture and seed color. Construct a Punnettsquare that depicts this cross. What are the predicted outcomes ofgenotypes and phenotypes of the offspring?
Following the Rule of Non-Mendelian Genetics (Incomplete Dominances), In a genetic cross between one snapdragon flower that is Homozygous (ww) for white petal color and one snapdragon flower that is Hemozygous (WW) for red petal color. What would be the phenotype of the offspring? (Legend: W = red color; w = white color

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