Linkage and Chromosome Mapping

Linkage and Chromosome Mapping

University

20 Qs

quiz-placeholder

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Linkage and Chromosome Mapping

Linkage and Chromosome Mapping

Assessment

Quiz

Biology

University

Medium

Created by

Yoon Yen Yow

Used 9+ times

FREE Resource

20 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is linkage in genetics?

Random assortment of genes on different chromosomes

Inheritance of two or more genes together on the same chromosome

Exchange of genetic material between sister chromatids

Inheritance of traits due to environmental factors

Answer explanation

Linkage in genetics refers to the inheritance of two or more genes together on the same chromosome, meaning they are likely to be passed on together during reproduction, unlike genes on different chromosomes that assort randomly.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What does a recombination frequency of less than 50% indicate?

Genes are not linked

Genes are linked

Genes are assorting independently

Crossing over does not occur

Answer explanation

A recombination frequency of less than 50% indicates that genes are linked, meaning they are located close to each other on the same chromosome and tend to be inherited together.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the unit for genetic map distance?

Chiasma

Recombination factor

Centimorgan (cM)

Linkage ratio

Answer explanation

The unit for genetic map distance is the centimorgan (cM), which represents a 1% chance of recombination occurring between two genes during meiosis. This makes it the standard measurement in genetics.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the relationship between crossing over and genetic variation?

Crossing over decreases genetic variation

Crossing over prevents recombination

Crossing over increases genetic variation by producing new allele combinations

Crossing over creates new genes

Answer explanation

Crossing over increases genetic variation by producing new allele combinations during meiosis, allowing for greater diversity in offspring. This process reshuffles genetic material, leading to unique combinations of traits.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which type of linkage results in no recombination?

Incomplete linkage

Complete linkage

Independent assortment

Triple linkage

Answer explanation

Complete linkage occurs when two genes are located very close to each other on the same chromosome, resulting in no recombination during meiosis. This means the alleles are inherited together without mixing.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In chromosomal mapping, what does a recombination frequency of 1% represent?

10 cM

1 cM

100 base pairs

10% recombination

Answer explanation

A recombination frequency of 1% corresponds to 1 centiMorgan (cM) in genetic mapping, indicating that genes are 1 cM apart on a chromosome. Thus, the correct answer is 1 cM.

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a double crossover?

Crossing over in non-homologous chromosomes

Exchange of genetic material at two different loci between chromatids

Exchange that involves only sister chromatids

Single chiasma formation

Answer explanation

A double crossover refers to the exchange of genetic material at two different loci between chromatids, resulting in a more complex rearrangement of genetic information compared to a single crossover.

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