Concept:The diagrams show mammalian gametes:
P is the sperm cell (male gamete) and
Q is the egg cell (female gamete).
Explanation:Sperm and egg cells are sex cells produced by male and female mammals respectively.
Both cells are involved in sexual reproduction, not asexual reproduction, so option A is incorrect.
In mammals, sperm and egg normally come from two different individuals of opposite sexes, so option B is incorrect.
These cells are found in mammals, not plants, so option C is incorrect.
The fusion of sperm and egg is called fertilisation.
Fertilisation leads to the formation of a zygote, which develops into a new mammal.
Therefore, the union of both cells gives rise to a new mammal.
Answer:D. The union of both cells gives rise to a new mammal.
