U2 Key Are 4- Variation and Inheritance

Question 1

Variation

Answer 1

The difference that exist between members of the same species

Question 2

What are the two types of variation

Answer 2

• discrete
• continuous

Question 3

What’s discrete variation

Answer 3

Where a characteristic falls into distinct groups

Question 4

What are discrete characteristics controlled by

Answer 4

Single genes

Question 5

What is continuous variation

Answer 5

Variation which can have a range of values between a minimum and a maximum

Question 6

What are continuous characteristics

Answer 6

Polygenic which means they are controlled by many genes that act together

Question 7

Inheritance

Answer 7

When a trait is passed on from one generation to the next

Question 8

How many sets of chromosomes do gametes contain

Answer 8

One

Question 9

How many sets of chromosomes do diploid cells contain

Answer 9

2 matching sets

Question 10

Alleles

Answer 10

Different forms of the same cell

Question 11

Genotype

Answer 11

Refers to the combination of alleles that an organism has

Question 12

Phenotype

Answer 12

Refers to the physical characteristics of an organism

Question 13

Dominant

Answer 13

Allele which even if only 1 is present is always expressed in a phenotype

Question 14

Recessive

Answer 14

Allele which is only expressed if two of these alleles are present

Question 15

Homozygous

Answer 15

Possessing two identical alleles of the gene
E.g. GG or gg

Question 16

Heterozygous

Answer 16

Possessing two different alleles of the gene
E.g. Gg

Question 17

Monohybrid cross

Answer 17

The study of the inheritance of one characteristics