The nucleus of a cell contains chromosomes. Chromosomes carry genes.

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Presentation transcript:

The nucleus of a cell contains chromosomes. Chromosomes carry genes. Inside the nucleus The nucleus of a cell contains chromosomes. Chromosomes carry genes. Genes code for proteins. Genes are made from DNA. Inside the nucleus

Inside the nucleus Inside the nucleus

Inside the nucleus Inside the nucleus

Chromosomes Chromosomes

Each daughter cell has the diploid number of chromosomes. Mitosis Mitosis is a form of cell division which produces exact copies of cells. Each daughter cell has the diploid number of chromosomes. Mitosis

Mitosis Mitosis

Mitosis Mitosis

Mitosis Mitosis

Each daughter cell has the haploid number of chromosomes. Meiosis Meiosis is a form of cell division which produces sex cells (e.g. sperm or egg cells). Each daughter cell has the haploid number of chromosomes. Meiosis

Meiosis Meiosis

Meiosis Meiosis

Meiosis Meiosis

Mitosis and Meiosis Mitosis and Meiosis

DNA strands are made from sugar, phosphate and bases DNA contains coded information that determines inherited characteristics DNA strands are made from sugar, phosphate and bases There are four bases – A, C, T and G DNA can replicate because base A and T always pair and C and G always pair. 3 bases code for one amino acid Chromosomes and DNA

Nucleotides Chromosomes

DNA Chromosomes

DNA replication Chromosomes

DNA bases Chromosomes

Gametes are sex cells (e.g. sperm or egg cells) Fertilisation Gametes are sex cells (e.g. sperm or egg cells) When male and female gametes join in fertilisation, a zygote is formed. Fertilisation

Fertilisation Fertilisation

Fertilisation Fertilisation

Fertilisation Fertilisation

Fertilisation Fertilisation

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