PATHOLOGY MCQ
GENETICS AND DISEASE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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whether the father’s sperm contains an x or y chromosome
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whether the mother’s egg contains an x or y chromosome
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the age of the parents
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None of the above
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Detailed explanation-1: -Men determine the sex of a baby depending on whether their sperm is carrying an X or Y chromosome. An X chromosome combines with the mother’s X chromosome to make a baby girl (XX) and a Y chromosome will combine with the mother’s to make a boy (XY).
Detailed explanation-2: -Normal human spermatozoa carry either the X or the Y chromosome. The differences between X and Y spermatozoa (X and Y haploid cells) may exist in two areas: the different chromosomes (i.e. different kinds and numbers of genes) and the different sperm structures and functions (i.e. different genetic expression).
Detailed explanation-3: -A baby’s biological sex is determined by the two sex chromosomes in the egg and sperm. Eggs always have an X chromosome, and sperm have either an X or a Y chromosome. Whichever sperm is the winner will penetrate and fertilize the egg, creating either an XX (girl) or XY (boy) pair.