Log out Go to App
Go to App

Learning Materials

Features

Discover

Chapter 6: Problem 10

Inversions are said to "suppress crossing over." Is this ter. minology technically correct? If not, restate the description accurately.

Short Answer

Expert verified
Answer: Inversions can reduce or prevent crossing over in the affected chromosomal regions.

Step by step solution

01

Understanding Inversions

Inversions are chromosomal mutations in which a segment of a chromosome is reversed end to end. An inversion occurs when a chromosome breaks in two places and the resulting piece of the chromosome is reinserted in the opposite orientation.
02

Understanding Crossing Over

Crossing over is a process that occurs during meiosis, where homologous chromosomes (two chromosomes having the same genes at the same loci but can have different alleles) exchange segments by breaking and rejoining each other. It results in a recombinant chromosome with a different combination of alleles than the parent chromosomes. Crossing over increases genetic diversity within a population.
03

The Impact of Inversions on Crossing Over

When an inversion occurs in one of the homologous chromosomes, the corresponding segments may not align properly during meiosis. As a result, the exchange of genetic material through crossover becomes difficult, if not impossible, because the break points required for exchange do not match. In other words, the inversion suppresses crossing over.
04

Evaluating the Terminology

While the term "Inversions suppress crossing over" is generally understandable, it may not be technically precise. A more accurate description could be: "Inversions can reduce or prevent crossing over in the affected chromosomal regions." This description acknowledges that inversions can have varying degrees of impact on crossing over, rather than suggesting that they always completely suppress it. Additionally, it clarifies that the suppression of crossing over is specific to the affected regions of chromosomes and not a complete suppression across all regions.

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

In a recent cytogenetic study on 1021 cases of Down syndrome, 46 were the result of translocations, the most frequent of which was symbolized as $t(14 ; 21) .$ What does this designation represent, and how many chromosomes would you expect to be present in \(t(14 ; 21)\) Down syndrome individuals?

Review the Chapter Concepts list on page \(99 .\) These all center on chromosome aberrations that create variations from the "normal" diploid genome. Write a short essay that discusses five altered phenotypes that result from specific chromosomal aberrations.

Contrast the fertility of an allotetraploid with an autotriploid and an autotetraploid.

What explanation has been proposed to explain why Down syndrome is more often the result of nondisjunction during oogenesis rather than during spermatogenesis?

Human adult hemoglobin is a tetramer containing two alpha (a) and two beta ( \(\beta\) ) polypeptide chains. The \(\alpha\) gene cluster on chromosome 16 and the \(\beta\) gene cluster on chromosome 11 share amino acid similarities such that 61 of the amino acids of the \(\alpha\) -globin polypeptide ( 141 amino acids long) are shared in identical sequence with the \(\beta\) -globin polypeptide \((146\) amino acids long. How might one explain the existence of two polypeptides with partially shared function and structure on two different chromosomes? Include in your answer a link to Ohno's hypothesis regarding the origin of new genes during evolution.
See all solutions

Recommended explanations on Biology Textbooks

Substance Exchange

Read Explanation

Microbiology

Read Explanation

Responding to Change

Read Explanation

Communicable Diseases

Read Explanation

Bioenergetics

Read Explanation

Ecology

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