Meiosis, Cell Differentiation And Mitosis - Cells In Animals And Plants

Question 1

What is meiosis?

Answer 1

Cell division to make sex cells.

Question 2

What does differentiation mean.?

Answer 2

Process that cells change to become specialised.

Question 3

What cells are undifferentiated?

Answer 3

Stem cells

Question 4

Specialised cells - what does sperm cells do?

Answer 4

Tail to help swim to egg
Has alot of mitochondria for energy for swimming

Question 5

Specialised cells - nerve cells - what do they do?

Answer 5

Long to cover distance in body
Have branches at end to connect to other nerve cells.

Question 6

Specialised cells - what do muscle cells do?

Answer 6

Long so they hagenspace to contract.
Have lots of mitochondria for energy for contraction.

Question 7

Specialised cells - what do root hair cells do?

Answer 7

Grow into long hairs that stick into soil.
Absorbs water and minerals from soil.

Question 8

Specialised cells - what does xylem and phloem cells do?

Answer 8

Phloem cells transport food
Xylem cells transport water

Question 9

Chromosomes

Answer 9

Nucleus of cell contains chromosomes
These sre coiled up lengths of DNA molecules.
Each chromosome carries a large number of genes,
Different genes control the development of characteristics.
Body cells normally have two copies of each chromosome.
There are 23 pairs of chromosomes in a human cell.