Genetics And Evolution

Front 1

Dioecious

Back 1

Male and female flowers are located on seperate plants. PLants with flowers that produce only ovules or plants produce only pollen. (Having the male and female reproductive organs in seperate individuals)

Front 2

Monoecious

Back 2

PLant species with seperate male and female flowers or perfect flowers on the same plant/individual.

Front 3

Perfect flower

Back 3

Has both male and female parts

Front 4

Imperfect flower

Back 4

Has either male OR female parts.

Front 5

Staminate

Back 5

Shedding pollen in the afternoon, after the stigmas are receptive in the morning, the flower is effectively staminate.

Front 6

Pistillate

Back 6

Once the stamens have finished shedding pollen in the moning, the stigma/stigmas may then become receptive in the afternoon.

Front 7

Minimising self pollination (as moset flowering plants are hermaphrodite)

Back 7

(self incompatibility): Heteromorphic: 2-3 morphs on seperate, or, same plant. Pollen from one morph cannot cross pollinate flowers with the same morph.

Homomorphic: Sporophytic Self incompatibility and Gametophytic self incompatibilty.

Front 8

HOw is self incompatibility genetically controlled?

Back 8

Controlled at the S locus. (contains both male and female genes).

At two different loci, if the alleles expressed at these two diffeernt loci in the pollen grain match those of the pistil, then they will be inhibited.