Gametes and Fertilisation Flashcards
What is the male gamete
Sperm
What is the female gamete
Egg
Where is the DNA stored in a sperm
Nucleus
Name 2 adaptations that a sperm has for carrying out its job
A tail
Enzymes in its head
Streamlined shape
Why does a sperm have tail
To help it swim towards the egg cell
What enables the sperm to penetrate through the egg and where in the sperm are they found
Enzymes allow the spermicide to penetrate through the egg and are found in the sperms head
How does a streamlined shape help a sperm
It allows it to move more efficiently
Name a adaptation the egg cell has for carrying out its job
Large amount of cytoplasm
Why does a egg cell store so much cytoplasm
It provides nutrients for a developing embryo
What does the nucleus in an egg cell contain
Chromosomes
What in an egg cell surrounds the cytoplasm
The productive outer layer
How many chrono does a sperm carry
23
How many chromosomes will a zygote have
46
What is ovulation
When one ovary releases an egg roughly every 28 days
Where does fertilisation take place
In the oviduct
What is fertilisation
During sexual intercource millions of sperm are ejected into the vagina.These sperm will swim up the vagina through the cervix into the uterus and down the oviduct.If the sperm meets and egg the twos nucleus will join and create a zygote
What happens a zygote as it travels down the oviduct
It begins to divide and divide forming a ball of cells
What happens to the ball of cells when in reaches the uterus
It will sink into the lining of the uterus this is called implantation and now the mother is pregnant
What will the ball of cells continue to grow into to
A foetus and remain being called this until it is born
