Variation

Question 1

why is variation important

Answer 1

so that all organisms are not genetically identical so that they can evolve to the environment

Question 2

give 3 ways variation is possible

Answer 2

meiosis, mutations, chance fertilization

Question 3

explain meiosis variation

Answer 3

random arrangement of chromosomes in metaphase on equator and random crossing over of bivalents in P1
creates new alleles and therefore genetic variance

Question 4

explain mutation variations

Answer 4

alteration in the nucleotide sequence (germ line/ gamaetic)
change in order/ duplication of chromosome- create new gentotypes which can lead to new phenotypes

Question 5

explain chance fertilization variation

Answer 5

random male sperm will fertilize random female ovum resulting in uniques organisms with different combinations of traits

Question 6

distinguish between continuous and discontinuous variation

Answer 6

continuous is variation that has multiple genes therefore range of phenotypes and environmental component such as height
discontinuous is single gene with multiple alleles at locus and no environmental component such as blood groups