INHERITANCE VARIATION AND EVOLUTION - Genetic Inheritance

Question 1

Alleles

Answer 1

Each gene may have different forms called alleles e.g gene for attachement of earlobes has 2 alleles - attached or free. One allele from the mother one from the father

Question 2

Genotype

Answer 2

Combination of the alleles present in a gene e.g bb

Question 3

Phenotype

Answer 3

How alleles are expressed (what characteristics appears) e.g blue eyes

Question 4

Homozygous

Answer 4

If 2 alleles present are the same e.g BB or bb

Question 5

Heterozygous

Answer 5

If alleles are different e.g Bb

Question 6

Dominant

Answer 6

Is always expressed even if only one copy is
present

Question 7

Recessive

Answer 7

Only expressed if two copies are present (therefore no dominant allele present)