B6

Question 1

Is mitosis asexual or sexual reproduction

Answer 1

Asexual

Question 2

Is meiosis asexual or sexual reproduction?

Answer 2

Sexual

Question 3

What is the first stage of mitosis?

Answer 3

-The DNA replicates to form two copies of each chromosome
- also grows and copies its internal structure such as mitochondria and ribosomes

Question 4

What is the second stage of mitosis?

Answer 4

One set of chromosome is pulled to each end of the cell. The nucleus also divides

Question 5

What is the final stage of mitosis?

Answer 5

The cytoplasm and cell membrane divide to form two identical cells

Question 6

When does mitosis take place?

Answer 6

When an organism repairs itself eg when a broken bone heals

Question 7

How many daughter cells does mitosis produce?

Answer 7

2

Question 8

Are the daughter cells of mitosis identical?

Answer 8

Yes

Question 9

Unlike mitosis cell division, by meiosis, only takes place in…

Answer 9

Sex organs

Question 10

What do we have at the end of meiosis?

Answer 10

Four non-identical haploid gametes

Question 11

How many times does the cell divide in meiosis?

Answer 11

Twice

Question 12

Variation can be due to differences in…

Answer 12

• the genes that have been inherited
• the conditions in which they have developed (environmental cause)
• a combination of genes and environment

Question 13

All species of living things have evolved by…

Answer 13

Natural selection

Question 14

What is natural selection?

Answer 14

A process where organisms that are a better adapted to an environment will survive and reproduce

Question 15

Fossils could be

Answer 15

-The actual remains of an organism that has not decayed
Mineralised forms of the hard parts of an organism such as bones
Traces of organisms, such as footprints or burrows

Question 16

What are the steps of selective breeding?

Answer 16

1. Choose a parent who have the desired characteristic
2. Select the best offspring and breed these to make the next generation
3. These offspring are then bred again and again over many generations until a desired result is achieved

Question 17

To reduces the rate at which antibiotic resistant strains appear, we should:

Answer 17

• only use antibiotics when they are really needed, not for treating non serious infections
• patients should complete their courses of antibiotics even if they start to feel better
• the agricultural use of antibiotics should be restricted