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Chapter 12: Q. 27 (page 328)

Use a Punnett square to predict the offspring in a cross between a dwarf pea plant (homozygous recessive) and a tall pea plant (heterozygous). What is the phenotypic ratio of the offspring?

Short Answer

Expert verified

The phenotypic ratio will be 1 tall:1 dwarf.

Step by step solution

01

Step. 1 Introduction

The Punnett square is perhaps a square layout used only to forecast genotypes of a certain crossover or breeding attempt.

02

Step. 2 Explanation

The genotypes given within the boxes of the Punnett square will be Tt, Tt, tt, and tt. The phenotypic ratio is then 1 dwarf : 1 tall.


t
t
T
TtTt
ttttt

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Most popular questions from this chapter

Figure 12.16 In pea plants, purple flowers (P) are dominant to white flowers (p) and yellow peas (Y) are dominant to green peas (y). What are the possible genotypes and phenotypes for a cross between PpYY and ppYy pea plants? How many squares do you need to do a Punnett square analysis of this cross?

Assuming no gene linkage, in a dihybrid cross of AABB x aabb with AaBb F1 heterozygotes, what is the ratio of the F1 gametes (AB, aB, Ab, ab) that will give rise to the F2 offspring?

a. 1:1:1:1

b. 1:3:3:1

c. 1:2:2:1

d. 4:3:2:1

If the allele encoding polydactyly (six fingers) is dominant why do most people have five fingers?

a. Genetic elements suppress the polydactyl gene.

b. Polydactyly is embryonic lethal.

c. The sixth finger is removed at birth.

d. The polydactyl allele is very rare in the human population.

A farmer raises black and white chickens. To his surprise, when the first generation of eggs hatch all the chickens are black with white speckles throughout their feathers. What should the farmer expect when the eggs laid after interbreeding the speckled chickens hatch?

a. All the offspring will be speckled.

b. 75% of the offspring will be speckled, and 25% will be black.

c. 50% of the offspring will be speckled, 25% will be black, and 25% will be white.

d. 50% of the offspring will be black and 50% of the offspring will be white.

In a mating between two individuals that are heterozygous for a recessive lethal allele that is expressed in utero, what genotypic ratio (homozygous dominant:heterozygous: homozygous recessive) would you expect to observe in the offspring?

a. 1:2:1

b. 3:1:1

c. 1:2:0

d. 0:2:1
See all solutions

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