Question

The foetus completes its growth within the _____

• A. 23 pairs of chromosomes.
• B. 22 pairs of chromosomes.
• C. 48 chromosomes.
• D. 40 chromosomes.

Answer 1

The correct option is B

22 pairs of chromosomes.

An ovum is produced in the ovary. From the ovary, it is released into the oviduct. Ovum is fertilised by the sperm to give rise to a zygote inside the oviduct. The zygote divides to form an embryo which is implanted into the uterus. Inside the uterus the umbilical cord is a tube-like structure that connects a fetus to the mother's placenta, providing oxygen and nutrient-rich blood and removing waste. The embryo completes its development inside the amnion. Amnion is a membranous covering formed by the embryonic cells during the early stages of growth. Amnion is filled with amniotic fluid which prevents dehydration and protects the growing embryo from mechanic shocks.