Inheritance

Question 1

What is an allele

Answer 1

A version of a gene that codes for a specific protein

Question 2

Definition of dominant allele

Answer 2

Only needs one allele to be expressed

Question 3

Definition of a recessive allele

Answer 3

Needs two alleles to be expressed

Question 4

Definition of heterozygous

Answer 4

Each contain the one of each allele for example “Tt”

Question 5

Definition of homozygous

Answer 5

Both chromosomes have the same allele for example “tt” or “TT”

Question 6

Definition of a phenotype

Answer 6

An individual’s physical characteristics

Question 7

Definition of genotype

Answer 7

the combination of alleles (forms of the gene) that a person has for a particular trait

Question 8

What is meant by the term “co-dominant”

Answer 8

2 dominant alleles expressed equally so 50:50

Question 9

What is a mutation

Answer 9

A change in the sequence of bases in DNA

Question 10

How to answer question about natural selection

Answer 10

Mutations increase variation in population of…

… are more likely to survive due to mutation

This allows them to reproduce and pass their alleles to their offspring

This mutation then becomes more common in the population

Question 11

How do bacteria develop a resistance to antibodies

Answer 11

Variation in bacteria due to mutation which causes some to develop a resistance to antibiotics,

Bacteria produced by division of resistant bacteria will also have the resistance

If antibiotics are taken, non-resistant bacteria are killed and resistant bacteria population increases due to lack of competition

Antibiotics resistance becomes more common in population