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To make more of the same kind ( not needed for the survival of an induvidial but needed for the survival of a species
Time line of developing child
sperm+egg (gametes)---> Fertilization----> Zygote-----> gestation------> birth
Allows for internal fertilization, sperm is realeased inside the femal and increases the changefor sperm to reach the egg
A complex series of events which involves the interaction of the endocrine system and reproductive system
4 phases of the Menstrual Cycle
Follicle Stag, Ovultion(Day 14) Corpus Luteum Stage, Menstruation- Uterine linging is shed, bleeding begins)
4 Hormoes involves in the Menstrual Cycle
FSH-Follicle Stimulationg hormone LH-Lutenizing Hormone, Progesterone, Estrogen
After a zygote undergoes cleavage and forms into a blastula it forms into this and forms the layers Ectoderm, Mesoderm, and the endoderm
Made up of DNA whih carries cells genetic info passed from one generation to the next sister chromatids
Largest phase where the nuclear envelope disapears, chromosomes are visible, spindle froms fiber that guides the chromosomes where to go
Cell starts to tear, nucleus starts to form, chromosomes gather at the end of eah cell (clevage begins)
Cytoplasm splits (cleavage), this usually happens in telophases, results in 2 idemtical cells with identical number of chromosomes
Cell Division is controlled....
When cells come into contct with other cells they respond by not growing
Cell division that ends up with 4 cells that have half the number of chromosomes as the parents, sex cells has the same phases as mitosis just twice
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