Chromosomes and Sex Determination

Upon completion of this lesson, students should be able to:

  • Describe and differentiate mitosis and meiosis cell division.
  • List the stages of both cell division with distinguishing features.

 

Notes

Introduction to Cell Division

The process of dividing the preexisting cell into two or more daughter cells is called cell division. Meiosis and mitosis are two types of cell division. Mitosis divides one diploid mother cell divides into two diploid daughter cells whereas meiosis divides one diploid mother cell divides into four haploid daughter cells. This note gives brief introduction to cell division and their types.

Meiosis Cell Division

Meiosis is reductional division, which takes place in reproductive cell. It is divided into meiosis I and meiosis II. Meiosis I is divided into prophase I, metaphase I, anaphase I, telophase I and mitosis into prophase II, metaphase II, anaphase II, and telophase II. This note has detail information on different stages of meiosis cell division.

Mitosis Cell Division

Mitosis is divided into interphase, prophase, metaphase, and telophase. Mitosis cell division helps in asexual reproduction, growth, healing wounds and genetic stability. This note has description on how mitosis division occurs in living cell. It has detail information of different stages of mitosis.

Chromosomes

There are a number of chromosomes that differ from one to another species which are in pairs. A chromosome is a long, linear double-stranded DNA molecule with a protein coat that is responsible to transfer hereditary characters from parent to other generations.

 

Sex Determination

The mechanism which fixes the sex of an individual when it begins life is known as sex determination. Sex is determined at the time of fertilization when the male gamete and female gametes fuse together.