The average ratio of male to female individua | vedclass

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(D) In humans,sex determination is of the $XY$ type. During gametogenesis,males produce two types of sperms: $50\%$ carrying the $X$ chromosome and $5

Vedclass · Accepted Answer

$1:1$

Vedclass · Answer

(D) In humans,sex determination is of the $XY$ type. During gametogenesis,males produce two types of sperms: $50\%$ carrying the $X$ chromosome and $50\%$ carrying the $Y$ chromosome. Females produce only one type of egg,carrying the $X$ chromosome. When a sperm carrying the $X$ chromosome fertilizes an egg,a female $(XX)$ is produced. When a sperm carrying the $Y$ chromosome fertilizes an egg,a male $(XY)$ is produced. Since the probability of either type of sperm fertilizing the egg is equal ($50\%$ each),the theoretical ratio of male to female offspring is $1:1$.

The average ratio of male to female individuals based on $XX$ and $XY$ type of sex determination in the total human population is:

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