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

Short Answer

Expert verified

The cross is made between the heterozygous pea plants for pod color and shape. The phenotypic ratio is obtained as 9:3:3:1.

Step by step solution

01

Description of Punnet square

Reginald C. Punnett proposed the Punnet square method. The biologist mainly uses this diagram to predict the probability of inheritance patterns. The genetic cross made between the organisms is tabulated using a table.

02

Crossing of plants

Plant crossing is defined as the cross-pollination of two different varieties of plants. Crossing of plants can take place naturally by cross-pollination or artificially induced methods to produce hybrid varieties.

Hybrid variety plants usually contain the special genetic characters that are seen in the parent plants.

03

Punnet square of tea plants

The pod colors chosen are green and yellow, and the pod shape is inflated and constricted. The crossing is obtained with the character: green inflated, green constricted, yellow inflated, and yellow constricted.

GI

Gi

gI

gi

GI

GGII

GGIi

GgIi

GgIi

Gi

GGIi

GGii

GgIi

Ggii

gI

GgII

GgIi

ggII

ggIi

gi

GgIi

Ggii

ggIi

ggii

The phenotypic traits are obtained in the ratio of green inflated, green constricted, yellow inflated, and yellow constricted as 9:3:3:1, respectively.

The green inflated is caused by phenotypes such as GGII, GGIi, GgIi, GgIi, GGIi, GgIi, GgII, GgIi, and GgIi.

The green constricted phenotypes are Ggii, GGii, and Ggii.

The yellow inflated phenotypes are ggII, ggIi, and ggIi.

The yellow constricted phenotype is ggii.

The dominant trait is GGII, and the recessive trait is ggii.

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Most popular questions from this chapter

Over the past half-century, there has been a trend in the United States and other developed countries for people to marry and start families later in life than did their parents and grandparents. What effects might this trend have on the incidence (frequency) of late-acting dominant lethal alleles in the population?

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You are handed a mystery pea plant with tall stems and axial flowers and asked to determine its genotype as quickly as possible. You know that the allele for tall stems (T) is dominant to that for dwarf stems (t) and that the allele for axial flowers (A) is dominant to that for terminal flowers (a).

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(d) Explain how the results of your cross and your predictions will help you learn the genotype of your mystery plant.

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