pollination

• what is meant by pollination

  this is the transfer of pollen grain from the anther to the stigma
• What do pollen grains contain?

  male gametes
• what is the main purpose of pollination

  fertilization
• what is meant by fertilization in terms of pollination

  this is when the male gametes are brought into contact with the female part of the flower
• what is self pollination

  this is the transfer of pollen grains from the anther to the stigma of the same plant
• will there be genetic variation in self pollination


  yes
• what two processes lead to genetic variation in self pollination

  crossing over and independent assortment
• will self pollination or cross pollination have the more genetic variation and why

  cross pollination due to the mixing of parental genotypes
• what is cross polination

  this is the transfer of pollen grains from an anther to a stigma of a different plant of the same species
• is there genetic variation in cross polination

  yes due to the pollen being transferred to another plant
• what will cause genetic variation in cross pollination

  crossing over, independent assortment and the mixing of parental genotypes
• what will be used for cross pollination

  wind and insects
• what are the advantages of self pollination

  only on parentis needed , can help maintain genotypes which are well adapted to the current environment
• what are the disadvantages of self polination

  less genetic variation so offspring will be less likely to survive changes in environment , increase chance of genetic diseases
• why may self pollination lead to the increase chance of genetic diseases

  there will be an increased chance of homozygous for recessive alleles
• what are the 4 reasons why cross pollination will occur rather then self pollination

  in self pollination the stamen and stigma ripen at different times , the anther is below the stigma , genetic incompatibility and plants being unisexual