GENETICS AND EVOLUTION
GENETIC BASIS OF INHERITANCE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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How often chromosomes separate in anaphase 1
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frequency of genes separating by crossing over
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how homologous pairs pair up in metaphase 1
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frequency of cells separating in cytokinesis
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Detailed explanation-1: -We can see if two genes are linked, and how tightly, by using data from genetic crosses to calculate the recombination frequency. By finding recombination frequencies for many gene pairs, we can make linkage maps that show the order and relative distances of the genes on the chromosome.
Detailed explanation-2: -A genetic map is based on the concept of genetic linkage: the closer two markers are to each other on a chromosome, the greater the probability that they will be inherited together. By studying inheritance patterns, the relative order and location of genetic markers along a chromosome can be established.
Detailed explanation-3: -The linkage distance is calculated by dividing the total number of recombinant gametes into the total number of gametes.
Detailed explanation-4: -The greater the frequency of crossovers between two genes, the greater the distance between them.
Detailed explanation-5: -The closer two genes were to one another on a chromosome, the greater their chance of being inherited together. In contrast, genes located farther away from one another on the same chromosome were more likely to be separated during recombination.