2.7 (P1) Cell Division Flashcards Preview

AQA GCSE - Biology > 2.7 (P1) Cell Division > Flashcards

Flashcards in 2.7 (P1) Cell Division Deck (16)
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1

Are chromosomes normally in pairs or not?

In pairs

2

What are chromosomes made from?

DNA

3

What are genes?

Short sections of DNA

4

Why do cells divide?

To repair and grow

5

What has to happen before the cell can divide?

Copies of genetic material has to be made

6

What are the two types of cell division?

Mitosis
Meiosis

7

Describe mitosis

Copies of the genetic material are made
The cell divides once to form two genetically identical body cells

8

What are the properties of mitosis?

One cellular division
Produces diploid body cells (homologous - in pairs)
Produces genetically identical daughter cells

9

Describe meiosis

Copies of the genetic material are made
Then the cell divides twice to form 4 gametes, each with a single set of chromosomes

10

What are the properties of meiosis?

Two cellular division
Produces gametes (haploid)
Leads to variation
Only has one chromosome from the original pair

11

What happens at fertilisation?

Gametes join to make a single body cell with new pairs of chromosomes

12

What are cells called that are undifferentiated?

Stem cells

13

When do most animal cells differentiate?

At an early stage in development

14

Where can you get stem cells from?

Bone marrow
Embryonic stem cells

15

What are the benefits of using embryos as stem cells?

Prevent children transferring disease
Cure diseases
Help conditions like paralysis
Grow organs instead of donors

16

What are the drawbacks of using embryos as stem cells?

Unethical as life at conception
Expensive
Against God's will
Most still in research phase