Topic 7.1 - Genetic Variation
- Created by: Alice Cullen
- Created on: 30-12-16 13:00
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- A difference in the characteristics of individulas of the same species may be caused by a difference in:
- The genes that they have inherited- genetic causes
- The conditions that they have developed in- environmental causes
- Or a combination of the above
- The information that results in plants and animals inheriting similar characteristis to their parents, is carried by genes
- These are passed on in the sex cells (gametes) from which the offspring develop
- The nucleus of a cell contains chromosomes
- Chromosomes carry genes that control the characteristics of the body
- Chromosomes are normally found in pairs
- In human body cells, one of the 23 pairs of chromosomes carry the genes that determine sex
- In females the sex chromosomes are the same: **
- In males the sex chromosomes are different: XY
- Different genes control the development of different characteristics of an organism
- Some characteristics are controlled by a single gene
- Each gene may have different forms called alleles
- Some characteristics are controlled by a single gene
- If both chromosomes…
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