Concept explainers
DRAW IT Two pea plants heterozygous for the characters of pod color and pod shape are crossed. Draw a Punnett square to determine the
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)
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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