Genetics

Question 1

The nucleus of…

Answer 1

a cell contains DNA made of chromosomes

Question 2

Chromosomes are…

Answer 2

arranged in pairs

Question 3

Humans have…

Answer 3

2 copies of each gene

Question 4

A version of…

Answer 4

a gene is called an allele

Question 5

What are alleles?

Answer 5

Some characteristics are caused by a single gene

Question 6

An example allele is

Answer 6

fur colour in mice

Question 7

Alleles can be

Answer 7

represented with letters

Question 8

For a dominant allele to be
expressed, how many copies of
the allele are needed?

Answer 8

1

Question 9

For a recessive allele to be
expressed, how many copies
of the allele are needed?

Answer 9

2

Question 10

The combination of alleles that
the cause is a characteristic called
the…

Answer 10

Genetype

Question 11

The characteristic which is
expressed is called the…

Answer 11

Phenotype

Question 12

Homozygous alleles

Answer 12

The same alleles

Question 13

Heterozygous alleles

Answer 13

Different alleles