Genetics And Evolution

Question 1

What does variation mean?

Answer 1

Differences between organisms

Question 2

What does species mean?

Answer 2

A group of living organisms containing similar individuals

Question 3

What is interbreeding?

Answer 3

To have fertile offspring (e.g a labradoodle)

Question 4

What can variation be caused by?

Answer 4

The environment and our genes

Question 5

Variation can be what?

Answer 5

Discrete or continuous

Question 6

Where is the DNA in a sperm and egg cell?

Answer 6

In the nucleus

Question 7

How does the DNA play a role in making a baby?

Answer 7

When the sperm cell fertilised the egg cell, the two nuclei join and the DNA from both parents will give the instructions for a baby.

Question 8

In every body cell how many chromosomes do we have?

Answer 8

We have 23 pairs so 46 chromosomes in every body cell.

Question 9

How many chromosomes do the egg and sperm cell have before fusing together?

Answer 9

23 chromosomes

Question 10

What is an allele?

Answer 10

A different version of the same gene. For example, there is a gene that codes for human eye colour, and there are some several alleles eg coding for blue eyes, brown eyes etc.

Question 11

How many alleles do you inherit for each gene?

Answer 11

You inherit just two alleles of each gene due to the pairs of chromosomes we saw earlier, one allele from each parent.