3.24c Mitosis

Understand that division of a diploid cell by mitosis produces two cells which contain identical sets of chromosomes

3.24b Mitosis

Understand that division of a diploid cell by mitosis produces two cells which contain identical sets of chromosomes

3.24a Mitosis

 

Understand that division of a diploid cell by mitosis produces two cells which contain identical sets of chromosomes

3.16 DNA and Genetic information

3.16 DNA and Genetic information

Describe a DNA molecule as two strands coiled to form a double helix, the strands being linked by a series of paired bases: adenine (A) with thymine (T), and cytosine (C) with guanine (G)

Why are the two sections known as the 'sugar phosphate backbone?

3.15 Genes

Why is the genetic information transformed into protein?

3.14 Chromosomes

3.14 Chromosomes

Recall that the nucleus of a cell contains chromosomes on which genes are located

Chromosomes are the genetic information within a cell. Within the nucleus a number of chromosomes would be found.

A chromosome is composed of a molecule DNA. This forms the shape known as the double helix.

Sections of the molecule are called Genes.

One chromosome will have thousands of genes carrying information for the construction of a protein.

Protein gives the characteristic associated with the gene such as a blood group.

A gene controls the production of protein which then controls the characteristic.

Different organisms have different amounts of chromosomes (per cell) :

Cat - 38

Chicken - 78

Chimpanzee - 42

Humans - 46

Chromosomes operate in pairs known as homologous pairs

The homologous nature is based on the length of a chromosome

How many homologous pairs are there in a human?

3.1 Sexual and Asexual Reproduction

3.1 Sexual and Asexual Reproduction

Describe the differences between sexual and asexual reproduction

What are chromosomes?