Genes, Chromosomes and DNA

Question 1

3 examples of things that do asexual reproduction:

Answer 1

• Strawberry Plant - using stems that grow along the ground (runners)
• Potatoes - using tubers
• Insects such as aphids - Asexually reproduction allows them to reproduce much faster

Question 2

Name the 3 key features of a sperm cell:

Answer 2

• Acrosome - contains certain enzymes used to break down the wall of the egg and fertilise it.
• Nucleus - contains 23 chromosomes
• Tail - helps the sperm move through the uterus. It contains mitochondria to give it energy

Question 3

Name the 3 main parts of an egg cell:

Answer 3

• very large - stores food and energy for the cell ( in the cytoplasm)
• Nucleus - containing 23 chromosomes
• Jelly coat - to protect in when it is moving into the uterus

Question 4

What does the Nucleus contain?

Answer 4

Genetic material in the form of chromosomes

Question 5

What do chromosomes carry?

Answer 5

Genes

Question 6

What are alleles?

Answer 6

Different versions of the same gene

Question 7

What shape is a DNA molecule?

Answer 7

Double helix