Reproduction

Asexual- only one cells is required, binary fission, splits into 2 Sexual-two gametes (sex cells), always 2 cells involved, gametes has a set of chromosomes (23)

In sexual reproduction usually cells in one part of the body divide by mitosis and then break off from the parent to form a new organism All the offspring are genetically identical Asexual reproduction happens in all types or organisms

In sexual reproduction sex cells called gametes are produces There are two types, male and female The make gamete must move to the female gamete and fuse with it This is called fertilisation They new cell formed is called a zygote The offspring are not genetically identical

Advantages: Increase genetic variation Disease is less likely to affect all the individuals in a population Species can adapt for new environment Disadvantages: takes time + energy, requires to find a mate

Advantages: faster, more energy efficient, only requires one sex cells is (parent cell), rapid increase in population size Disadvantages: does not lead to genetic variation in a population, genetically identical-unable to adapt to new environments

Its a fusion of 2 gametes (male and female) to produce a zygote that undergoes cell division and develops into an embryo

They are different in structure because they do not have to attract insects to the but do need to be exposed to the wind

They are adapted to attract insects to the but do to enable transfer of pollen

Pollen grains are very small, smooth and light to carry in wind. They occur in very large numbers

Stamens are outside so that they are exposed to the wind so that pollen can easily be blow away

Stigma outside so it is exposed to wind. Stigma are feathery to catch pollen carried on wind

Petals are small and green as there is no need to attract insects

Stamens inside so insect has to make contact

Large, sticky grains with barbs for hooking onto insect fur

Anthers positioned to run pollen onto insects

Large petals, brightly coloured to attract insects

Stigma inside flower to make sure of contact, sticky to collect pollen

Protect the flower when it is a bud

Colourful to attract the insects

Give out sugary liquid to attract insects

Produces male sex cells (pollen)

Traps pollen

Where pollen tube frowns down to female sex cells

Produces female sec cells (egg cell)