Reproduction and Development
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What are the male and female gametes?
Male Gamete: Sperm cell Female Gamete: Egg cell
Egg cells structures
-Bigger than most of the cells -size of the full stop(.)
Sperm cells structures
-Smaller than most other cells. -Have only a tiny amount of cytoplasm. -Have long tail, so that they can swim.
Why does egg cell need to be large?
Because to make space for food stores in its cytoplasm.
How many chromosomes are there in cells in body and gametes?
Every cells: 46 chromosomes Gametes: 23 chromosomes
How do lives start?
Life started as a single cell called Zygote.
How does Zygote create/make?
An egg cell + A sperm cell = Zygote
What are the gametes?
Reproductive cells
Where is chromosomes in a cell?
In its nucleus.
What do everycell have?
Chromosomes
Chromosome structures
-Long, thread-like structure. -made up of genetic material,which contains information about how the cell will develop.
How do other body cells except for gamete divde?
Mitosis cell division. Duplicateling one to two with same 46 chromosomes.(Identically)
Name for gamete cells division?
Meiosis cell division. Sharing 23 chromosomes each one. Different from each.
Development of Zygote
Zygote>Embryo>Fetus>baby>birth
Male reproductive system parts(8)
Testis, Sperm duct,Seminal Vesicle, Prostate gland, Urethra, Epididymis, Scrotum, Penis
Female Reproductive system (8)
Ovary, Oviduct, Cilia, Uterus, Uterus lining, Cervix, Vagina
Foetal Development (with months)
6w- 4mm long, all major organs begin to grow 8w- 13mm long, starts to moving around 11w- 50mm long, Become foetus, all organs have developed, move vigorously 11w above-grows steadily 38/39w-all organs finished developing and growing, Ready to be born
Giving birth
-Muscles in uterus contract,get Shorter -Make the opening of uterus wide so the baby can pass through -Muscles contract in diff way to push the bby through opening of uterus and vagina