Reproduction

Question 1

How do asexual animals reproduce?

Answer 1

1. Cells divide to make identical copies of themselves through a process called mitosis.
2. Offspring is a genetic clone of parent. They have the same number of chromosomes.

Question 2

What are the 3 types of asexual reproduction?

Answer 2

1. fragmentation eg. starfish
2. binary fission eg. amoeba
3. budding eg. yeast

Question 3

How does sexual reproduction work?

Answer 3

A sperm cell and an ovum (egg cell) join together to become one cell.

Question 4

What are pros and cons of asexual reproduction?

Answer 4

Pros:
1. Fast reproduction rate
2. No mate needed - saves energy
Cons:
1. No genetic variation = no adaptation
2. Disease risk
3. Only suitable to one habitat

Question 5

What are pros and cons of sexual reproduction?

Answer 5

Pros:
1. Increased genetic diversity. More ability to adapt and evolve.
2. Low disease risk.
Cons:
1. Slow reproductive rate
2. Fewer offspring
3. Energy to find mate

Question 6

What is internal fertilisation?

Answer 6

The fusion of the male and female gametes inside the female body.

Question 7

What is external fertilisation?

Answer 7

The fusion of the male and female gametes outside the female body.

Question 8

What are the pros and cons of internal fertilisation?

Answer 8

Pros : Chances of survival of the offspring are increased.
Cons: Only a limited number of offspring can be produced.

Question 9

What are the pros and cons of external fertilisation?

Answer 9

Pros: Chances of survival of the offspring are markedly reduced.
Cons: A LARGE NUMBER of eggs are produced.

Question 10

What are some examples of organisms that do external fertilisation?

Answer 10

Fish, Frogs, Starfish