3.7.1.1 Inheritance

Question 1

Define dominant gene

Answer 1

An allele whose phenotype is always expressed

Question 2

Define recessive gene

Answer 2

An allele whose phenotype only appears if both copies of the gene are present

Question 3

Define carrier

Answer 3

A person carrying an allele which is not expressed in the phenotype but can be passed to offspring

Question 4

Define F1 generation

Answer 4

The offspring of 2 homozygous individuals (F1 gen will be heterozygous)

Question 5

Define F2 generation

Answer 5

The offspring of the F1 generation interbreeding

Question 6

Define monohybrid inheritance

Answer 6

The inheritance of a characteristic controlled by a single gene

Question 7

What is co-dominance? & example

Answer 7

• Both alleles are expressed in the phenotype
• No recessive alleles
• Given an intermediate phenotype
• e.g. Sickle cell anaemia

Question 8

What does multiple alleles mean?

Answer 8

Genes with more than 2 possible alleles within a population

Question 9

Define dihybrid inheritance

Answer 9

The simultaneous inheritance of two characteristics