Two pea plants heterozygous for the characters of pod color and pod shape are cr

Question

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. A man with type A blood marries a woman with type B blood. Their child has type O blood. What are the genotypes of these three individuals? What genotypes, and in what frequencies, would you expect in future offspring from this marriage? A man has six fingers on each hand and six toes on each foot. His wife and their daughter have the normal number of digits. Remember that extra digits is a dominant trait. What fraction of this couple's children would be expected to have extra digits? A pea plant heterozygous for inflated pods (li) is crossed with a plant homozygous for constricted pods (ii). Draw a Punnett square for this cross to predict genotypic and phenotypic ratios. Assume that pollen comes from the ii plant. Flower position, stem length, and seed shape are three characters that Mendel studied. Each is controlled by an independently assorting gene and has dominant and recessive expression as indicated in Table 14.1. If a plant that is heterozygous for all three characters is allowed to self-fertilize, what proportion of the offspring would you expect to be as follows? homozygous for the three dominant traits homozygous for the three recessive traits heterozygous for all three characters homozygous for axial and tall, heterozygous for seed shape Phenylketonuria (PKU) is an inherited disease caused by a recessive allele. If a woman and her husband, who are both carriers, have three children, what is the probability of each of the following? All three children are of normal phenotype. One or more of the three children have the disease. All three children have the disease. At least one child is phenotypically normal. The genotype of F_1 individuals in a tetrahybrid cross is AaBbCcDd. Assuming independent assortment of these fair genes, what are the probabilities that F_2 offspring will have the following genotypes? Aabbccdd AaBbCcDd AABBCCDD AaBBccDd AaBBCCdd

Explanation / Answer

1.Ans.Two pea plants heterozygous for pod color and pod shape were crossed

Pod color - Green (G) and yellow (g) and Pod shape Expanded (E) and Constricted (e)

Heterozygous for both

GgEe × GgEe

GGEE

Green

Expanded

GGEe

Green

Expanded

GgEE

Green

Expanded

GgEe

Green

Expanded

GGEe

Green

Expanded

GGee

Green

Constricted

GgEe

Green

Expanded

Ggee

Green

Constricted

GgEE

Green

Expanded

GgEe

Green

Expanded

ggEE

yellow

Expanded

ggEe

yellow

Expanded

GgEe

Green

Expanded

Ggee

Green

Constricted

ggEe

yellow

Expanded

ggee

yellow

constricted

Phenotypic Ratio = Green Expanded : Green Constricted : yellow Expanded : Yellow constricted

= 9 : 3 : 3 : 1

2.Ans.

Man with type A blood, woman with type B blood have child with type O blood

Genotype of Father with A type - IAi

Genotype of Mother with type B - IBi

genotype of child with O type - ii

IAi × IBi

IAIB

AB blood Type

IBi

B Blood type

IAi

A blood type

ii

O blood type

we can expect offspring with Genotypes of IAIB,IBi, IAi in equal frequencies.

GE Ge gE ge GE

GGEE

Green

Expanded

GGEe

Green

Expanded

GgEE

Green

Expanded

GgEe

Green

Expanded

Ge

GGEe

Green

Expanded

GGee

Green

Constricted

GgEe

Green

Expanded

Ggee

Green

Constricted

gE

GgEE

Green

Expanded

GgEe

Green

Expanded

ggEE

yellow

Expanded

ggEe

yellow

Expanded

ge

GgEe

Green

Expanded

Ggee

Green

Constricted

ggEe

yellow

Expanded

ggee

yellow

constricted

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