There are _ number of linkage groups in humans.
Correct answer: D. 23
- A. 46
- B. 22
- C. 80
- D. 23
Explanation
This phenomenon of staying together of all the genes of a chromosome is called linkage. Gene linkage is a physical relationship between genes. A chromosome carries its linked genes in the form of a linkage group. The number of linkage groups corresponds to the number of homologous pairs of chromosomes. Man has 23 linkage groups.
This question appeared on the UHS MDCAT 2018 paper, which you can sit online with every answer explained.
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About Gene Linkage and Crossing Over
Linked genes lie on the same chromosome and tend to pass together, unlike genes that assort independently on different chromosomes. The topic connects linkage with homologous pairing, crossing over during prophase I of meiosis, recombinant and parental offspring, and recombination frequency as an estimate of gene distance.
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More Gene Linkage and Crossing Over questions
Fruit flies with gray, normal wings (BbVv) are crossed with flies that have black, vestigial wings (bbvv).The difference in actual results and expected results of this cross indicates that the alleles for body colour and wing length:
The given diagram shows crossing over during meiosis.The diagram that identifies the outcome of this crossing over is:
The recombination frequency between two genes of a chromosome is directly proportional to the:
Which of the following reduces the chance of recombination and variation?
Crossing over brings:
The chance of a cross-over between two loci is directly proportional to their: