Sex Determination Flashcards

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Note: We may include questions that have multiple correct answers. It’s useful to remember specific examples to understand these concepts better.

How many pairs of chromosomes are in the human body, and what do they control?

The human body has 23 pairs of chromosomes. 22 pairs, called autosomes, control our characteristics, and the 23rd pair, known as sex chromosomes, determine the sex of an individual.

What are the sex chromosomes for females and males?

In females, the sex chromosomes are XX.

In males, the sex chromosomes are XY.

How is the biological sex of a child determined?

A child’s biological sex is determined by the sex chromosome contributed by the father. The mother always contributes an X chromosome, while the father can contribute either an X or a Y chromosome.

What is the chance of having a male or female child?

There is a 50% chance of having a female child (XX) and a 50% chance of having a male child (XY), making the average ratio of female to male offspring 1:1.

What chromosomes do egg and sperm cells carry?

All egg cells carry an X chromosome. Half of all sperm cells carry an X chromosome, and the other half carry a Y chromosome.

What is the significance of the 23rd pair of chromosomes?

The 23rd pair of chromosomes, known as the sex chromosomes, determine the sex of an individual.

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