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Chapter 2: Problem 8

In a cross between a heterozygous tall pea plant and a dwarf plant, predict the ratios of the offspring's genotypes and phenotypes.

Short Answer

Expert verified
The genotypic ratio of offspring in a cross between a heterozygous tall pea plant and a dwarf pea plant is 1:1 (1 Tt : 1 tt). The phenotypic ratio is also 1:1, with half the offspring being tall (Tt) and half being dwarf (tt).

Step by step solution

01

Determine Genotypes of Parent Plants

The genotypes of the parent plants are first determined. A tall plant that is heterozygous would have a Tt genotype (where T represents the dominant tall allele and t represents the recessive dwarf allele). A dwarf plant would be homozygous recessive, hence tt.
02

Set Up the Punnett Square

A Punnett square is set up to predict the genotypes of the offspring. The Punnett square is a 2x2 grid, with one parent鈥檚 alleles on the top and the other parent鈥檚 on the side. T and t would be written on the top (representing the tall plant鈥檚 alleles) and t and t would be written on the side (representing the dwarf plant鈥檚 alleles).
03

Fill in the Punnett Square

Fill in the Punnett square by dragging each top allele down into the boxes below and each side allele across into the boxes to its right. This results in the creation of four boxes within the square, each representing a possible genotype for the offspring.
04

Determine Genotypic and Phenotypic Ratios

The genotypic ratio is determined by counting the proportion of each genotype among the outcomes in the Punnett square. The phenotypic ratio is determined based on these genotypes, keeping in mind that T is dominant to t. Thus, genotypes of Tt and TT will yield tall plants, and tt will yield dwarf plants.

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Most popular questions from this chapter

In humans, the allele for brown eye color \((B)\) is dominant to that for blue eye color ( \(b\) ). If two heterozygous parents produce children, what are the following probabilities? A. The first two children have blue eyes. B. A total of four children, two with blue eyes and the other two with brown eyes. C. The first child has blue eyes, and the next two have brown eyes.

Describe the significance of nonparentals with regard to the law of independent assortment. In other words, explain how the appearance of nonparentals refutes a linkage hypothesis.

Honeybees are unusual in that male bees (drones) have only one copy of each gene, but female bees have two copies of their genes. This difference arises because drones develop from eggs that have not been fertilized by sperm cells. In bees, the trait of long wings is dominant over short wings, and the trait of black eyes is dominant over white eyes. If a drone with short wings and black eyes was mated to a queen bee that is heterozygous for both genes, what are the predicted genotypes and phenotypes of male and female offspring? What are the phenotypic ratios if we assume an equal number of male and female offspring?

With regard to genotypes, what is a true-breeding organism?

A cross is made between a pea plant that has constricted pods (a recessive trait; smooth is dominant) and is heterozygous for seed color (yellow is dominant to green) and a plant that is heterozygous for both pod texture and seed color. Construct a PunnettC9. Do you know the genotype of an individual with a recessive trait and/or a dominant trait? Explain your answer.
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