Question
Asked Nov 11, 2019
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Use a Punnett square to predict the results of monohybrids and dihybrid crosses, giving both genotypic and phenotypic ratios

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Expert Answer

Step 1

A cross that involves single pair of contrasting characters is known as monohybrid cross. Such a cross was first performed by Gregor Johann Mendel in the pea plant to study the alleles, which are responsible for different traits. He crossed the pea plant having contrasting traits, which are tall and dwarf. Similarly, a cross that involves two pairs of contrasting characters are known as dihybrid cross.

Step 2

Phenotype represents the visible traits of an organism while genotype denotes the actual genetic makeup present in the cell. A Punnett square is the tabular summary that includes possible combination of the parental alleles to determine the genotype of the offspring.

 

Monohybrid cross:

In the given cross, true breeding yellow pod and true breeding green pod are two contrasting traits of a single character. Here, green pod is dominant over yellow pod. Let G and g represent green and yellow pod respectively. If these two plants are crossed, all the F 1plants re found to...

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gg Parental generation GG G Gametes G G Gg Gg Gg Gg G F2 Gg GG G Gg gg bo

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