SG 11: Chap 17 & 18 Reproductive System
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Be able to explain all the stages of the human life cycle
pre-embryonic: beings with fertilization- 2nd week embryonic: 3 weeks - 8 weeks fetal: embryo week 9 - birth postnatal period: growth and development after birth Infancy, childhood, adolescence and adulthood
What is a gamete? How many chromosomes are found in a human gamete?
sex cells, a mature haploid male or female germ cell that is able to unite with another of the opposite sex in sexual reproduction to form a zygote. there are 23
What is a Zygote? How many chromosomes are found in a human zygote?
a zygote is a fertilized ovum. an ovum is when the oocyte undergoes its second meiotic division. it has 46 chromosomes. 23 from each parent resulting in a diploid cell.
What is meiosis?
a type of cell division that results in four haploid daughter cells each with half the number of chromosomes of the parent cell, as in the production of gametes.
How many cells result at the end of meiosis?
4 haploid daughter cells.
How many chromosomes do they have during meiosis?
23
What is the purpose of doing meiosis?
keeps the num of chromosomes constant from generation to generation and increases variability in the population
How many chromosomes does a somatic cell have?
46
How many chromosomes does a gamete have?
23
What is a gonad?
are the reproductive organs. testes or ovaries
What are the main differences between oogenesis and spermatogenesis, regarding the period of life in which they occur and the number of functional gametes they produce?
spermatogenesis: the development of sperm in 2 months in testes oogenesis: development of eggs occur before a woman’s birth and remain their immature state until she reaches puberty. 400-500 eggs will ever mature. one egg is released every month after that.
What is a polar body?
once the primary oocytes divides, it forms two cells
What is mitosis?
a
How many cells result at the end of mitosis?
a
How many chromosomes do they have during mitosis?
a
What is the purpose of doing mitosis?
a
Be able to describe and give the function of the ovary in female
a
Be able to describe and give the function of the oocyte in female
a
Be able to describe and give the function of the ovum in female
a
Be able to describe and give the function of the oviduct in female
a
Be able to describe and give the function of the Fallopian tube in female
a
Be able to describe and give the function of the uterus in female
a
Be able to describe and give the function of the cervix in female
a
Be able to describe and give the function of the vagina in female
a