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Cell Division - Nucleus and Chromosomes (GCSE Biology)

Nucleus and Chromosomes

Chromosomes

Chromosomes in Nucleus

The nucleus contains genetic information. Most cells have a nucleus, which contains the genetic information of the cell. This information affects the make up of the cell, and determines which proteins are made.
DNA is packaged in chromosomes. A chromosome is a molecule made up of many coiled up sections of DNA. It is important that the DNA does not become tangled.
DNA makes up genes. Genes are sequences of DNA that code for certain characteristics. Each chromosome therefore contains many genes.

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Chromosome Pairs

Chromosomes come from biological parents. Each cell has 23 pairs of chromosomes. Each set of chromosomes gets one copy from the father and the other from the mother. Therefore, the chromosomes are
found paired.
If chromosomes are not paired, it could lead to genetic disease. Many genetic conditions occur due to problems in chromosome pairing. A common example is Down’s Syndrome, in which patients suffer from an extra 21st chromosome.

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Cell Division - Nucleus and Chromosomes (GCSE Biology)

Nucleus and Chromosomes

Chromosomes

Chromosomes in Nucleus

Chromosome Pairs

Still got a question? Leave a comment

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AQA 1. Cell biology

AQA 2. Organisation

AQA 3. Infection and response

AQA 4. Bioenergetics

AQA 5. Homeostasis and response

AQA 6. Inheritance, variation and evolution

AQA 7. Ecology

AQA 8. Key ideas

CIE IGCSE 1 Characteristics and classification of living organisms

CIE IGCSE 10 Diseases and immunity

CIE IGCSE 11 Gas exchange in humans

CIE IGCSE 12 Respiration

CIE IGCSE 13 Excretion in humans

CIE IGCSE 14 Coordination and response

CIE IGCSE 15 Drugs

CIE IGCSE 16 Reproduction

CIE IGCSE 17 Inheritance

Cell Division – Nucleus and Chromosomes (GCSE Biology)

CIE IGCSE 18 Variation and selection

CIE IGCSE 19 Organisms and their environment

CIE IGCSE 2 Organisation of the organism

CIE IGCSE 20 Biotechnology and genetic engineering

CIE IGCSE 21 Human influences on ecosystems

CIE IGCSE 3 Movement in and out of cells

CIE IGCSE 4 Biological molecules

CIE IGCSE 5 Enzymes

CIE IGCSE 6 Plant nutrition