What is a gene GCSE Bitesize?
A gene is a small section of DNA on a chromosome that codes for a particular sequence of amino acids, to make a specific protein. It is the unit of heredity, and may be copied and passed on to the next generation.
What is a chromosome GCSE AQA?
Chromosomes carry genetic information in a molecule called DNA. A type of cell division called mitosis ensures that when a cell divides each new cell produced has the same genetic information. DNA exists in a cell’s nucleus within structures called chromosomes .
What is a gene and a chromosome?
Genes are segments of deoxyribonucleic acid (DNA) that contain the code for a specific protein that functions in one or more types of cells in the body. Chromosomes are structures within cells that contain a person’s genes. Genes are contained in chromosomes, which are in the cell nucleus.
What is a gene made up of GCSE?
A gene is a small section of DNA on a chromosome, that codes for a particular sequence of amino acids , to make a specific protein . It is the unit of heredity , and may be copied and passed on to the next generation.
What does DNA stand for GCSE?
deoxyribonucleic acid
DNA stands for deoxyribonucleic acid. It is a chemical made up of two long molecules. The molecules are arranged in a spiral, like a twisted ladder. We call this the double helix structure.
What is genotype GCSE?
The genotype is the collection of alleles that determine an organism’s characteristics. When these interact with the environment they are expressed as a phenotype . Alleles are the two copies of a gene on a pair of chromosomes.
What is the difference between a gene and an allele GCSE?
The chromosome in each pair carries the same gene in the same location. These genes could be the same, or different versions. Alleles are different versions of the same gene. For example, the gene for eye colour has an allele for blue eye colour and an allele for brown eye colour.
What are chromosomes ks3?
The chromosomes are found in the nucleus of each cell. Each cell with a nucleus contains chromosomes, which are made from DNA. Human body cells each contain 23 pairs of chromosomes, half of which are from each parent. So, human gametes (eggs and sperm) each contain 23 chromosomes.
What happens during prophase BBC Bitesize?
The daughter cells are clones of each other….The stages of mitosis in detail.
| Stage | What happens |
|---|---|
| Interphase | The cell spends most of its life in this phase. The DNA in chromosomes copies itself ready for mitosis. |
| Prophase | The DNA in chromosomes and their copies condenses to become more visible. The membrane around the nucleus disappears. |
What is a gene Class 10?
Genes are the specific parts of a chromosome (DNA segment) which determine the hereditary characteristics.
What are genes Class 9?
Genes are functional units of heredity as they are made of DNA. The chromosome is made of DNA containing many genes. Every gene comprises of the particular set of instructions for a particular function or protein-coding. Speaking in usual terms, genes are responsible for heredity.
What are genes ks2?
Genes carry the information that determines your traits (say: trates), which are features or characteristics that are passed on to you — or inherited — from your parents. Each cell in the human body contains about 25,000 to 35,000 genes.