Chapters 14-15: Reproduction and Variation Flashcards Preview

GCSE Biology > Chapters 14-15: Reproduction and Variation > Flashcards

Flashcards in Chapters 14-15: Reproduction and Variation Deck (9):
1

What is asexual reproduction?

A type of reproduction involving only 1 parent, creating genetically identical offspring (however they may appear different due to environmental variation). There is no fusion of gametes and the only type of cell division involved is mitosis

2

What is binary fission?

When a bacteria reproduces asexually by splitting in two

3

What is vegetative reproduction?

Any asexual reproduction without forming seeds or spores

4

What is sexual reproduction?

A type of reproduction involving 2 parents, creating offspring with DNA from both parents. The male gamete and the female gamete fuse and fertilisation occurs

5

What are the gametes in plants?

Pollen and ova

6

Why do animals that do not care for their young need to produce more ova?

To increase the number of their offspring that reach sexual maturity

7

What is selective breeding?

A process where humans choose animals to breed together so that their offspring have more desirable characteristics

8

Why do non-identical twins form?

A woman releases 2 eggs during ovulation which are fertilised by 2 different sperm and develop simultaneously in the uterus

9

Why do identical twins form?

One fertilised egg splits into 2 cells, which each develop into identical fetuses