Which one of the following conditions of the zygotic cell would lead to the birth of a normal human female child?
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Which one of the following conditions of the zygotic cell would lead to the birth of a normal human female child?
✓ Correct answer: a) Two X chromosomes
ExplanationThe correct answer is Option A: Two X chromosomes.In humans, sex determination depends on the combination of sex chromosomes present in the zygote.A normal human female has two X chromosomes (XX).This condition arises when an X-bearing sperm fertilizes an X-bearing ovum.The presence of two X chromosomes ensures normal female development, including proper formation of reproductive organs and secondary sexual characters.Option B (only one Y chromosome) is not viable, as at least one X chromosome is essential for survival.Option C (only one X chromosome) results in Turner syndrome (XO), which is not a normal female condition.Option D (one X and one Y chromosome) produces a normal male child (XY).Therefore, a zygotic cell with two X chromosomes leads to the birth of a normal human female child.
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