sexual reproduction

• Sexual reproduction involves two parents: male and female.

• Male parent produces sperm, female produces egg (ovum).

• Gametes are special sex cells used in reproduction.

• Fertilisation is fusion of sperm and egg together.

• Fertilisation forms a zygote which is single cell.

• Zygote divides repeatedly to form an embryo.

• Embryo grows and develops into new organism.

• Offspring produced are not identical to the parents.

• Offspring show variation due to genes from parents.

• Variation is important for evolution and species adaptation.

• Sexual reproduction increases genetic diversity in population groups.

• Process takes more time and energy than asexual.

• Found in humans, animals like fish, frogs, cats.

• Also found in flowering plants like rose, pea.

• Reduces risk of diseases affecting all offspring equally.

• Helps species to survive better in changing environment.

• Plays a major role in species continuation successfully.

notes

sexual reproduction is a type 2 parents and 2 kinds of gamete

makes a lot time , can reproduce only few, parent will be weak if reproduce more