Log out Go to App
Go to App

Learning Materials

Features

Discover

Chapter 12: Q. 29 (page 328)

Why is it more efficient to perform a test cross with a homozygous recessive donor than a homozygous dominant donor? How could the same information still be found with a homozygous dominant donor?

Short Answer

Expert verified

Because if the genotype from the undetermined parent could be ascertained from a single generation. It is far more advantageous to use a homozygous recessive partner because the genotypes of the unknown partner may be determined.

Step by step solution

01

Step1.  Introduction

A test cross is the experimental crossover between a dominant phenotypic individual with such an undetermined genotype and then a recessive allele organism.

02

Step2. Explanation

It is more efficient to select a homozygous recessive donor since the genotype of the uncertain partner may be identified together in single generation. The undetermined genotype still might be discovered when a homozygous dominant donor had been utilised. Instead of determining the unknown genotype via the F1 phenotype, the F1 progeny must be self-crossed as well as the F2 generation phenotypes will be utilised to discover the unidentified F0 genotype.

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

Figure 12.5In pea plants, round peas ( R ) are dominant to wrinkled peas ( r ). You do a test cross between a pea plant with wrinkled peas (genotype rr ) and a plant of unknown genotype that has round peas. You end up with three plants, all of which have round peas. From this data, can you tell if the round pea parent plant is homozygous dominant or heterozygous? If the round pea parent plant is heterozygous, what is the probability that a random sample of 3 progeny peas will all be round?

The ABO blood groups in humans are expressed as the I A , I B , and i alleles. The I A allele encodes the A blood group antigen, I B encodes B, and i encodes O. Both A and B are dominant to O. If a heterozygous blood type A parent (I A i) and a heterozygous blood type B parent (I B i) mate, one quarter of their offspring will have AB blood type (I A I B ) in which both antigens are expressed equally. Therefore, ABO blood groups are an example of:

a. multiple alleles and incomplete dominance

b. codominance and incomplete dominance

c. incomplete dominance only

d. multiple alleles and codominance

Calculate the probability of selecting a heart or a face card from a standard deck of cards. Is this outcome more or less likely than selecting a heart suit face card

A scientist pollinates a true-breeding pea plant with violet, terminal flowers with pollen from a true-breeding pea plant with white, axial flowers. Which of the following observations would most accurately describe the F2 generation?

a. 75% violet flowers; 75% terminal flowers

b. 75% white flowers in terminal position

c. 75% violet flowers; 75% axial flowers

d. 75% violet flowers in an axial position

Labrador retrievers’ fur color is controlled by two alleles, E and B. Any dog with the ee__ genotype develops into a yellow lab, while B_E_ dogs become black labs and bbE_ dogs become chocolate labs. This is an example of _____.

a. epistasis

b. codominance

c. incomplete dominance

d. linkage
See all solutions

Recommended explanations on Biology Textbooks

Cells

Read Explanation

Ecological Levels

Read Explanation

Microbiology

Read Explanation

Cell Communication

Read Explanation

Biology Experiments

Read Explanation

Biological Molecules

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.

Sign-up for free