1.2.12 Genes

Question 1

What two alleles does the CF gene appear in?

Answer 1

• Normal (F)

- Mutated (f)

Question 2

What is the phenotype of someone with the genotype of FF?

Answer 2

Normal

Question 3

What is the genotype if someone has the phenotype of having CF?

Answer 3

ff

Question 4

What is the phenotype of someone with the genotype of Ff?

Answer 4

Carries of CF

Question 5

What is a genotype?

Answer 5

Genotype - made up of alleles a person has

Question 6

What is a phenotype?

Answer 6

Phenotype - the characteristics a person has, caused by the genotype

Question 7

What can be used to show the expected genotype of offspring?

Answer 7

The expected genotypes can be shown using a punnett square

Question 8

What is affected is someone has thalassaemia?

Answer 8

This gene makes haemoglobin. If someone has the genetic disease, they will either not make haemoglobin, or they will make non-functioning haemoglobin.

Question 9

What happens to someone if they are hetrozygous for thalassaemia?

Answer 9

They will have some protection from malaria. This is called ‘hetrozygous advantage’.

Question 10

What will happen to someone if they are homozygous for achondroplasia?

Answer 10

They will die

Question 11

What will happen to someone who is hetrozygous for achondroplasia?

Answer 11

They will have restricted growth, especially in the limbs

Question 12

Define locus

Answer 12

The positioning of a gene

Question 13

Define allele

Answer 13

A variation of a gene