Self pollination and cross pollination advantage and disadvantages.
Answers
Answer:
A very few pollen grain can pollinate the flower.
Purity of the race is maintained.
Self-pollination avoid wastage of pollen grains.
Less chances of failure of pollination.
The disadvantages of self-pollination come from a lack of variation that allows no adaptation to the changing environment or potential pathogen attack. Self-pollination can lead to inbreeding depression caused by expression of deleterious recessive mutations,or to the reduced health of the species, due to the breeding of related specimens. This is why many flowers that could potentially self-pollinate have a built-in mechanism to avoid it, or make it second choice at best. Genetic defects in self-pollinating plants cannot be eliminated by genetic recombination and offspring can only avoid inheriting the deleterious attributes through a chance mutation arising in a gamete.
cross pollination
Disadvantages of cross pollination: It is not always certain as a pollinating agent is always required, and it may or may not be available at the suitable time. Pollen grains have to be produced in abundance to ensure chances of pollination. This results in lot of wastage of pollen.
1) Cross pollination results in much healthier offsprings.
Self pollination results in weaker offsprings.
2)New varieties(hybrids) are produced by cross pollination.
No new varieties are produced by self pollination.
3) Pollen grains produced are abundant and viable. The genetic diversity associated with cross pollination , increases the pace of evolution besides hybrid vigour of seed germination.
Pollen grains are produced in small quantities in self pollination.
I hope my explanation helped you.
Explanation: