Asexual Reproduction
Give one advantage of asexual reproduction
Dont have to find a mate, dont have to produce gametes, quickly populate an area
half the genetic information (haploid)
Nectary, sepal, petal
Where is sperm produced?
Testes
How many months does it take for a human embryo to fully develop?
9 months
Give one disadvantage of asexual reproduction
No genetic variation, overpopulate one area, accumulation of mutations/poor genes
Give one disadvantage of sexual reproduction
Requires a lot of energy , need to find a mate,
Name one female part of the plant
Stigma, ovule, ovary, style
Where is the egg produced?
Ovary
Where in the female reproductive system does the embryo develop?
Uterus
Name one type of plant asexual reproduction
tuber, runner, bulb
Give one advantage of sexual reproduction
Creates variation allowing organisms to adapt to envrionmental changes
Name one male part of the plant
filament, anther, pollen
How many chromosomes do humans have?
46 chromosomes (23 pairs)
Where does fertilisation occur?
In the oviduct
What name describes an offspring with 100% similar DNA?
What are the name of the gametes in plants?
pollen and ovule
Name 2 methods of pollination
animal, wind, water
What is the name given to a fertilised egg cell?
Zygote
What does the placenta supply
oxygen, nutrients, waste disposal
What is the name for the method of asexual reproduction in yeast / bacteria
Budding
Describe fertilisation
The fusion of the gamete nuclei
True or False. Self-pollination produces genetically identical offspring
False - it is a method of sexual reproduction so produces variation
How many sperm make it to the egg?
20 (0.000008%)
Name one harmful substance that can cross the placental barrier and what harm it causes
nicotine, alcohol, lead/mercury, toxoplasmosis, thalidomide