If doubled haploids are produced from the pollen of a plant with the genotype Aa, which of the following lists all the possible doubled haploid genotypes that will be produced?

Question

BlackTom AI · Accepted Answer

To tackle this question, we first recall what a doubled haploid is: a line that originates from a haploid complement and then has its chromosome number doubled to become diploid, retaining homozygosity at each locus.
Option 1: 'AA, Aa, aa' suggests three possible outcomes, including the heterozygous Aa genotype. Since the starting plant is Aa, the pollen (gamete) can be either A or a, both of which are haploid. After doubling, these haploids become homozygous: AA or aa. The heterozygous Aa cannot occur in a doubled haploid, so this option is incorrect.
Option 2: 'A, a' lists gamete genotypes (haploid) rather than the resulting diploid doubled haploid genotypes. The question asks for the doubled haploid genotypes, not the gametes, so this is not the correct format or content.
Option 3: 'Aa' presents a heterozygous genotype. As explained, a doubled haploid is inherently homozygous at the locus in question, because it originates from a single haploid chromosome set that is then duplicated. Therefore Aa is impossible for a doubled haploid and this option is incorrect.
Option 4: 'AA, aa' exactly matches the two homozygous outcomes produced after doubling the haploid gametes from an Aa parent. When the pollen contributes P = A or P = a, doubling yields AA or aa, respectively. This aligns with the fundamental genetics of haploid doubling and homozygosity.
In summary, the only option that lists the complete and correct set of doubled haploid genotypes obtainable from an Aa parent is AA and aa, making this the correct choice.

If doubled haploids are produced from the pollen of a plant with the genotype Aa, which of the following lists all the possible doubled haploid genotypes that will be produced? Single choice

Similar Questions

In a cross of AaBbCc x AaBbCc, what is the probability of producing an offspring with the genotype aabbcc?

•Offspring of the P generation were called the F2 generation.

Suppose the gene that predetermines whether you have dimples on your cheeks is called 'gene D'. There are two variants of the gene: d and D. Persons with genotypes DD and Dd have dimples. Persons with genotype dd do not have dimples. Select the correct statement below:

Which of the following is true regarding genotype to phenotype expression?

A cross is made between two individuals that are AaBbCcDd. What is the probability that an offspring will be AaBbCcDD?

Mendel’s law of segregation is explained by

Which of the following statements is false?

Suppose you cross two plants that are both heterozygous for a given trait. On average, what fraction of their offspring will be heterozygous for the trait?

More Practical Tools for Students Powered by AI Study Helper

Homework AI Solver

Stylized AI Paper Writer

Plagiarism Checker Assistant

Citation AI Academic Writing Tool

In-Class Translation Assistant

AI Note Generator

AI Quiz Answers

Past Exam Questions from University Test Bank

Smart Practice Assistant

Adaptive Practice

Making Your Study Simpler