Welcome To Genetics !!

Genetics The Cell Cycle Chromosome Terms Meiosis Intro

The Cell Cycle a continuous sequence of cell growth and division consists of three stages: Interphase – growth of cell Mitosis – division of nucleus Cytokinesis – division of cytoplasm a

a

Interphase the period between cell divisions cells undergo their normal activities (obtaining energy, synthesizing products, repairing damage, etc.)

Mitosis The division of the nucleus – DNA 2 IDENTICAL CELLS are created Mitosis Super Easy

Cytokinesis the division of the cytoplasm and organelles occurs after mitosis

Chromosome Terms Chromatin term used to describe the genetic material during interphase all of the DNA molecules in the nucleus

Chromosome Terms Chromosome a single DNA molecule (either duplicated or unduplicated)

Chromosome Terms Chromatid a single strand in a duplicated chromosome

Chromosome Terms Sister Chromatids single stranded chromosomes that are attached together at their centromere genetically identical

When mitosis goes wrong… √ The Cell Cycle Chromosome Terms Meiosis Intro √

Meiosis somatic cells (body cells) are diploid (2n) they contain two copies of each chromosome human somatic cells contain 46 chromosomes

Meiosis meiosis is a special type of cell division that only occurs in the reproductive organs meiosis results in the production of reproductive cells called gametes (sperm and eggs)

Meiosis gametes are haploid (n) they contain only one copy of each chromosome human gametes contain 23 chromosomes

Meiosis each human sperm or egg cell contains: 1 sex chromosome that determines the sex of the individual 22 autosomal chromosomes (autosomes) that determine everything else

Lesson Outline √ The Cell Cycle Chromosome Terms Meiosis Intro √ √