
Linkage and Chromosome Mapping

Quiz
•
Biology
•
University
•
Medium
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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