REPRODUCTIVE STRATEGIES
Reproduction is necessary for a species to continue
Reproductive strategies make sure that a species can reproduce
successfully in their particular environment
To maximize reproductive success
Courtship is the beginning, EXTERNAL VS. INTERNAL FERTILISATION:
EXTERNAL FERTILISATION INTERNAL FERTILISATION
Aquatic animals use the water Terrestrial animals need to
they live in as a medium transfer the sperm from the
through which sperm can male to the female without it
swim to an egg being exposed to the air
Female lays her eggs and Penis transfers the sperm in a
then the male releases sperm fluid (semen) into the females
near or on them body
Fertilisation occurs inside the
Fertilisation happens in the body of the female
water & not inside the body
of the female Risk of sperm dying out,
hence why penis is used
No risk of sperm dying out
Less wastage of sperm because
Not all sperm reaches the it is put directly into the
eggs -> washed away by females body
currents or eaten by other
animals Less sperm & eggs produced
Produce lots of gametes to
increase the chance of sperm
finding an egg
, Fertilisation occurs when the male gamete (sperm) fuses with the female
gamete (egg/ovum) to form a diploid zygote
Semen: fluid that sperm are contained in
Increases the chances of success:
1 - transport medium for sperm
2 - contains nutrients for sperm
3 - has chemicals that activate sperm and help them to swim
4 - alkaline to neutralize the acid of the vagina
5 - has an antibiotic which protects the sperm from infections
CLOACA (in reptiles and birds)
An opening near the end of the body that acts as the single opening for
the digestive, urinary & reproductive systems
PROTECTION OF THE EMBRYO
OVIPARY
VIVIPARY
OVOVIVIPARY
OVIPARY
When the females releases her fertilized egg into the environment so that
the embryo develops inside an egg which is outside the females body
Reproduction is necessary for a species to continue
Reproductive strategies make sure that a species can reproduce
successfully in their particular environment
To maximize reproductive success
Courtship is the beginning, EXTERNAL VS. INTERNAL FERTILISATION:
EXTERNAL FERTILISATION INTERNAL FERTILISATION
Aquatic animals use the water Terrestrial animals need to
they live in as a medium transfer the sperm from the
through which sperm can male to the female without it
swim to an egg being exposed to the air
Female lays her eggs and Penis transfers the sperm in a
then the male releases sperm fluid (semen) into the females
near or on them body
Fertilisation occurs inside the
Fertilisation happens in the body of the female
water & not inside the body
of the female Risk of sperm dying out,
hence why penis is used
No risk of sperm dying out
Less wastage of sperm because
Not all sperm reaches the it is put directly into the
eggs -> washed away by females body
currents or eaten by other
animals Less sperm & eggs produced
Produce lots of gametes to
increase the chance of sperm
finding an egg
, Fertilisation occurs when the male gamete (sperm) fuses with the female
gamete (egg/ovum) to form a diploid zygote
Semen: fluid that sperm are contained in
Increases the chances of success:
1 - transport medium for sperm
2 - contains nutrients for sperm
3 - has chemicals that activate sperm and help them to swim
4 - alkaline to neutralize the acid of the vagina
5 - has an antibiotic which protects the sperm from infections
CLOACA (in reptiles and birds)
An opening near the end of the body that acts as the single opening for
the digestive, urinary & reproductive systems
PROTECTION OF THE EMBRYO
OVIPARY
VIVIPARY
OVOVIVIPARY
OVIPARY
When the females releases her fertilized egg into the environment so that
the embryo develops inside an egg which is outside the females body
