Meiosis Gamete Formation Homework 11 4 in Guided

Homework • 11 -4 in Guided Reading Workbook

Reproduction • Asexual reproduction - Asexual reproduction is the formation of new individuals from

Apply what we learned about human cells to drosophila melanogaster. • Does 2 N

Homologous - term used to refer to chromosomes that each have a corresponding chromosome

Meiosis • Meiosis is a process of reduction division in which the number of

• Formation of a tetrad while going through the process of crossing-over •

Meiosis is broken down into two halves. Meiosis I an Meiosis II

Gamete Formation • Meiosis produces four genetically different haploid cells.

Comparing Mitosis and Meiosis • Similar processes with very different and distinct outcomes •

Diploid - term used to refer to a cell that contains both sets of

Chromosomes Human’s have 46 chromosomes 23 from your mother’s egg 23 from your father’s

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Meiosis Gamete Formation

Homework • 11 -4 in Guided Reading Workbook

Reproduction • Asexual reproduction - Asexual reproduction is the formation of new individuals from the cell(s) of a single parent. The new cell (daughter cell) is usually identical to the parent. • Sexual reproduction - In sexual reproduction, two individuals produce offspring that have genetic characteristics from both parents. Sexual reproduction introduces new gene combinations in a population

Apply what we learned about human cells to drosophila melanogaster. • Does 2 N or N represent this cell best? • Is this cell haploid or diploid? • What number does N represent?

Homologous - term used to refer to chromosomes that each have a corresponding chromosome from the opposite-sex parent Homologous chromosomes are similar in shape, position and information, but not identical to each other.

Meiosis • Meiosis is a process of reduction division in which the number of chromosomes per cell is cut in half through the separation of homologous chromosomes in a diploid cell. • Tetrad - structure containing 4 chromatids that forms during meiosis. • crossing-over - process in which homologous chromosomes exchange portions of their chromatids during meiosis

• Formation of a tetrad while going through the process of crossing-over • This occurs during prophase I of meiosis

Meiosis is broken down into two halves. Meiosis I an Meiosis II

Meiosis II

Gamete Formation • Meiosis produces four genetically different haploid cells.

Comparing Mitosis and Meiosis • Similar processes with very different and distinct outcomes • Mitosis results in the production of two genetically identical diploid cells (2 N), whereas meiosis produces four genetically different haploid cells (N).

Diploid - term used to refer to a cell that contains both sets of homologous chromosomes Haploid - term used to refer to a cell that contains only a single set of chromosomes and therefore only a single set of genes

Chromosomes Human’s have 46 chromosomes 23 from your mother’s egg 23 from your father’s sperm A normal human cell is a diploid cell (2 N) A sex cell or gamete (egg or sperm) is a haploid cell (N) In human cell’s what does N represent? 23 chromosomes