Which of the Following Statements is True of Linkage

Question

Which of the following statements is true of linkage?
A)The closer two genes are on a chromosome, the lower the probability that a crossover will occur between them.
B)The observed frequency of recombination of two genes that are far apart from each other has a maximum value of 100%.
C)All of the traits that Mendel studied-seed colour, pod shape, flower colour, and others-are due to genes linked on the same chromosome.
D)Linked genes are found on different chromosomes.
E)Crossing over occurs during prophase II of meiosis.

Accepted Answer

Linkage refers to genes on the same chromosome that tend to be inherited together because they are physically close to each other. The closer two genes are on a chromosome, the lower the probability that a crossover will occur between them. This is because crossing over (the exchange of genetic material between homologous chromosomes) is more likely to happen between genes that are farther apart on a chromosome. Therefore, statement A is true.

B is false because the observed frequency of recombination cannot exceed 50%, which is the maximum value when the two genes are on different chromosomes.

C is false because not all traits studied by Mendel are due to genes linked on the same chromosome.

D is false because linked genes are found on the same chromosome.

E is false because crossing over occurs during prophase I of meiosis, not prophase II.