Friday, July 3, 2009

Chapter 4 Reproduction and Growth

Types of Reproduction

(1) Sexual reproduction
- using sex cells,which are called gametes
-involved male and female or two individuals
-humans,mammals,birds,reptiles,amphibians and fish

(2) Asexual reproduction
-without any gametes
binary fission
-spore formation

-vegetative reproduction

In humans,the male gametes, called sperm or spermatozoa,produced by reproductive organs called testes.

Females = ova

The production of the two gamets calle dmeiosis.

Process of meiosis produces haploid gametes which are genetically not the same with the parental cells.

Germinal epithelial cells (2n)
(through repeated mitosis)

Spermatogonia (2n)

Primary spermatocytes (2n)
(meiosis I)

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