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Define asexual reproduction
Production of genetically identical offspring from one parent
Advantages of asexual reproduction?
Fast, no mate needed, many offspring
Disadvantages of asexual reproduction?
No variation, vulnerable to disease and environmental change
Define sexual reproduction
Fusion of nuclei of two gametes producing genetically varied offspring
Advantages of sexual reproduction?
Variation increases survival chances
Disadvantages of sexual reproduction?
Requires two parents slower more energy
What is pollination?
Transfer of pollen from anther to stigma
What is fertilisation in plants?
Fusion of pollen nucleus with ovule nucleus
Conditions needed for germination?
Water oxygen suitable temperature
Adaptive features of sperm cells?
Flagellum, mitochondria, acrosome, enzymes
Adaptive features of egg cells?
Energy store jelly coat
Function of placenta?
Exchange nutrients, oxygen wastes between mother and fetus
How is HIV transmitted?
Sexual contact, blood, shared needles, mother to baby