Unit 4.2 - Self/Cross Pollination

Question 1

define self-pollination

Answer 1

transfer of pollen from the anther of a flower to the mature stigma of the same flower or another flower on the same plant of the same species

Question 2

define cross-pollination

Answer 2

transfer of pollen from the anther of a flower to the mature stigma of another flower on another plant of the same species

Question 3

what does self-pollination lead to

Answer 3

self-pollination =
self-fertilisation –> Interbreeding

Question 4

what does cross-pollination lead to

Answer 4

cross-pollination =
cross-fertilisation –> outbreeding

Question 5

what is genetic variation dependant on

Answer 5

• crossing over during prophase1 of meiosis
• independent assortment during metaphase1 of meiosis
• mutation

Question 6

how does self-pollination effect genetic variation

Answer 6

less genetic variation
= cannot quickly adapt to environmental changes

Question 7

how does cross-pollination effect genetic variation

Answer 7

more genetic variation

Question 8

in terms of alleles, how is self-pollination a disadvantage

Answer 8

there is a greater chance of 2 potentially harmful recessive alleles combining

Question 9

in terms of alleles, how is cross-pollination an advantage

Answer 9

there is a reduced chance of producing harmful combinations of alleles

Question 10

In terms of evolutions, how is cross-pollination an advantage

Answer 10

if the environment changes suddenly, it is likely that individuals within the population with a combination of alleles that will allow the species to survive

Question 11

In terms of evolutions, how is self-pollination a disadvantage+advantage

Answer 11

ADVANTAGE: successful genomes are preserved which is good in stable environments
DISADVANTAGE: bad if environment suddenly changes