OBJECTIVE LIFE SCIENCE
GENETICS
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
There is a 50/50 split between sperm with X or Y chromosome and each type is equally as likely to fertilise an egg that will always have an X chromosome.
|
|
|
There is a 50/50 split between eggs with X or Y chromosome and each type is equally as likely to be fertilised by a sperm that will always have an X chromosome.
|
|
|
There is a 50/50 split between eggs with X or Y chromosome and each type is equally as likely to be fertilised by a sperm that will always have an Y chromosome.
|
|
|
There is a 50/50 split between sperm with X or Y chromosome and each type is equally as likely to be fertilised by a egg that will always have an Y chromosome.
|
Detailed explanation-1: -If the sperm that reaches the egg has an X chromosome, the zygote will have, an XX sex chromosome, Since the ratio of the X chromosome and Y chromosome in a male gamete is 50:50, the probability of male or female infants is also 50:50.
Detailed explanation-2: -Y sperm: are faster but survive for less time in the female genital tract. X sperm: are slower, but they are more resistant and therefore survive longer.
Detailed explanation-3: -A child’s biological sex (male or female) is determined by the chromosome that the male parent contributes. Males have XY sex chromosomes while females have XX sex chromosomes; the male can contribute the X or Y chromosome, while the female must contribute one of their X chromosomes.