▶️ Answer/Explanation
In humans, sex determination is chromosomal. Females have two X chromosomes (XX) in their body cells, while males have one X and one Y chromosome (XY). The Y chromosome carries the SRY gene, which triggers male development. A YY combination is not viable in humans, as essential genes are located on the X chromosome. Therefore, only option A correctly matches the female sex with the XX chromosome pair.
✅ Answer: (A)
✅ Answer: (A)
Question
The diagram shows a baby, a child and an adult (not drawn to the same scale).
As a baby grows into an adult, which labelled region grows the most?
Answer/Explanation
Ans: C
Question
The graph shows the height of a child, from birth to the age of 10.
What was the approximate height of the child at 7 years of age?
A 106 cm B 116 cm C 122 cm D 130 cm
Answer/Explanation
Ans: B