2.4 - Variation

Question 1

What are the causes of variation in a population?

Answer 1

Some variation is genetic, environmental or both.

Question 2

Where do children get the genetic information from?

Answer 2

Half from each parent

Question 3

What is a haploid?

Answer 3

A sex cell (gamete) that contains one set of unpaired chromosomes

Question 4

Haploid (egg - 23 chrom) + haploid (sperm - 23 chrom) =

Answer 4

Diploid (zygote - 46 chrom)

Question 5

What are some examples of genetic variation?

Answer 5

Blood group, skin color, eye color, gender.

Question 6

What are some environmental causes of variation in a animal or plant?

Answer 6

Climate 
Diet 
Accidents (scar)
Culture (accent)
Lifestyle

Question 7

What is continuous variation? Give examples.

Answer 7

A characteristic that changes gradually over a range of values (height, weight, hand span)

Question 8

What is discontinuous variation? Give examples.

Answer 8

A characteristic with only a limited number of possible values ( gender, eye color, blood group)

Question 9

What happens in asexual reproduction?

Answer 9

Only one parent cell is needed
No fusion of gametes
Offspring produced is genetically the same as parent (clones)

Question 10

What are some examples of organisms that use asexual reproduction?

Answer 10

Bacteria

Production of spores by fungi

Question 11

What happens in sexual reproduction?

Answer 11

Requires tow parents ( male/ female).

Fertalisation is the fusion of the nucleus of the male and female gamete.