Variation and Inheritance

Question 1

discrete inheritance is controlled by:

Answer 1

a single gene

Question 2

Continuous variation is controlled by:

Answer 2

By many genes

Question 3

Allelle

Answer 3

the different forms of a gene

Question 4

Homozygous

Answer 4

Both alleles of a gene are the same

Question 5

Heterozygous

Answer 5

Both alleles of a gene are the same

Question 6

Dominant

Answer 6

The allele which shows in the phenotype when it is present and can mask a recessive form.

Question 7

Recessive

Answer 7

The allele are not shown in the phenotype unless both alleles are recessive as it is masked by a dominant form.

Question 8

Genotype

Answer 8

Alleles present in an organism

Question 9

Phenotype

Answer 9

An organism’s appearance which has resulted from genetic info

Question 10

Reasons for sample error in Genes:

Answer 10

1. Fertilisation is a random process

2. Sample size is small

Question 11

Sex cells are called:

Answer 11

Gametes

Question 12

Gametes are made in specialised organs called:

Answer 12

Gonods

Question 13

Diploid cells:

Answer 13

1. It has two sets of chromosomes

2. TWO sets of 23 chromosomes

Question 14

Haploid cells:

Answer 14

1. Has ONE set of chromosome
2. GAMETES are haploid
3. ONE of 23 chromosomes

Question 15

Male gametes:

Answer 15

1. produced in testes

2. sperm are motile ans has tail for swimming to the ovum

Question 16

Female gametes:

Answer 16

1. produced in OVARY

2. egg cells are larger in size because they contain large store of energy

Question 17

function of semen

Answer 17

• To provide fluid containing sugars for energy so that sperm can move

Question 18

Zygote:

Answer 18

is a fertilised egg cell

Question 19

Plants Male Gametes:

Answer 19

1. produced in pollen grains

Question 20

Plants Female Gametes:

Answer 20

1. Produce in Ovaries

Question 21

Anther

Answer 21

the part of the flower that produces pollen