Studied by 0 peopleOvary
Where eggs mature
Uterus
Where the foetus develops
Cervix
The entrance to the uterus
Vagina
The place that receives sperm from the penis
Oviduct
Where the egg is fertilised
Testes
Where sperm is made
Scrotum
Where the testes are kept outside of the body.
Urethra
The tune that lets urine leave your bladder and body
Penis
Carries the sperm from the testes to the urethra
Sperm Duct
Supply nutrients for the sperm
Gamates
Period
The loss of uterus lining through the vagina
Contraception
Method for preventing pregnancy
Condom
A layer of latex runner that prevents semen entering the vagina
Contraceptive pill
A daily tablet that contains hormones and stops ovulation.
Key features of sexual reproduction
two parents
genetic material from the parents is mixed
offspring shows variation
Implantation
When the embryo attaches to the lining of the uterus
Ways that contraceptives work
barrier
chemicals
hormones
Ovulation
When the egg is released
Day of ovulation
14
Normal length of menstrual cycle
28
Hormones
Chemical messengers that transmit information around the body in the blood
main female sex hormone
oestrogen
Luteinising hormones
Stimulates the release of an egg when it reaches its peak in the middle of the cycle
Where do characteristics come from?
parents
Chromosomes in sperm
23
Chromosomes in an egg
23
Gene
Sections of DNA that contain information to produce a characteristic
Allele
Different forms of the same gene
Dominant allele
Only need one copy of the dominant allele for the characteristic to be expressed in the organism
Recessive allele
The characteristic can only be expressed if you have two copies of the allele. You must inherit the allele from both biological parents.
Asexual reproduction
When only one parent is needed to reproduce
How does bacteria reproduce?
They divide in half
How do you make clones from asexual reproduction?
Grow them from cuttings
Advantages of growing plants from cuttings
Produced quickly
Cheap and simple
All characteristics form parent plant
Disadvantages of growing plants from cuttings
Reduces the variety of alleles available.
Gene pool
Different version of genes present in a population.
Reduced gene pool
Increases the risk of species being destroyed by disease or change in environment.
Male part of flower
Stamen
Female part of flower
Carpel
Anther
Produces pollen
Filament
Stigma
Style
Ovary
Pollination
Fertilisation (plants)
Seed dispersal
How does speed dispersal happen?
How does pollination work?
The main structures of seeds
Adaptations of some seeds
Ovules after fertilisation
Factors affecting seed travel
Note 
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