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(C) The image shows the $X$ and $Y$ chromosomes. Genes $a$ and $b$ are located on the same chromosome (the $X$ chromosome) and are very close to each

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haemophilia and red-green colour blindness

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(C) The image shows the $X$ and $Y$ chromosomes. Genes $a$ and $b$ are located on the same chromosome (the $X$ chromosome) and are very close to each other,indicating that they are linked genes.Linked genes are genes that are physically located on the same chromosome and tend to be inherited together.Haemophilia and red-green colour blindness are both well-known $X$-linked recessive disorders in humans.Because the genes responsible for these two conditions are located on the $X$ chromosome,they exhibit linkage and are often inherited together,which is a classic example of sex-linked inheritance.

Given below is a highly simplified representation of the human sex chromosomes from a karyotype. The genes $a$ and $b$ could be of

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Frequency of recombination between gene pairs on the same chromosome as a measure of the distance between genes to map their position on the chromosome was used for the first time by

Sex linkage was first observed by.....

The theory of recombination of linked genes due to crossing over of chromosomes during the pachytene stage of meiosis was put forward by:

. . . . . . $(B)$ . . . . . . used the frequency of recombination between gene pairs on the . . . . . . $(A)$ . . . . . . as a measure of the distance between genes and mapped their position on the chromosome.
$(A) \quad\quad (B)$

When white-eyed and miniature-winged $Drosophila$ $melanogaster$ is crossed with its wild type,it produces which of the following percentages of recombinants (in $\%$)?

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