Which chromosome combination is responsible for the birth of a girl in humans?
Answer and explanation
Correct answer: XX
In the usual human chromosomal system, females have two X sex chromosomes, written as XX, while males generally have one X and one Y, written as XY. An egg contributes an X chromosome, and an X-bearing sperm contributes the second X, producing an XX zygote. Therefore A is correct. YY is not a normal viable human combination, and XO represents a different chromosomal condition rather than the usual pattern.
Frequently asked questions
What is the correct answer to this question?
XX
Why is this the correct answer?
In the usual human chromosomal system, females have two X sex chromosomes, written as XX, while males generally have one X and one Y, written as XY. An egg contributes an X chromosome, and an X-bearing sperm contributes the second X, producing an XX zygote. Therefore A is correct. YY is not a normal viable human combination, and XO represents a different chromosomal condition rather than the usual pattern.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Heredity and Evolution. Topic: Sex determination.
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