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Inheritance, Gregor Mendel
- Stem cells
- Unspecialised embryonic cells
- Can be grown to replace tissuses, blood veins in the brain
- Can be used to combat inherited conditions
- Unspecialised embryonic cells
- Mendel
- Worked out how characteristics were inherited
- First to suggest seperately inherited characterisatics
- Took along time for his ideas to be accepted
- scientists didn't know about chromosomes and genes until after Mendel died.
- scientists didn't know about chromosomes and genes until after Mendel died.
- Worked out how characteristics were inherited
- Genes are found on chromosomes
- Chromosomes are made from DNA which is a very long molecule with a double helix structire
- Genes are short sections of DNA
- Chromosomes are made from DNA which is a very long molecule with a double helix structire
- everyone but identical twins have different genes
- HUMANS have 23 pairs of chromosomes
- 1 pair is the sex chromosomes
- Females- XX
- Males XY
- Females- XX
- 1 pair is the sex chromosomes
- HUMANS have 23 pairs of chromosomes
- Alleles
- Dominant- masks the effect of another
- Recessive- effect is masked by that of anothers
- PHenotype- PHysical apperarance
- Genotype- the Genetic make up- which alleles does the individual inhreit
- Genotype- the Genetic make up- which alleles does the individual inhreit
- Hetrozygous- same alleles eg. DD or dd
- Homozygous- two different alleles eg. Dd or dD
- Homozygous- two different alleles eg. Dd or dD
- Dominant- masks the effect of another
- Inherited diseases
- cystic fibrosis
- caused by a recessive allele
- this means the allele must be inherited from both parents
- this means the allele must be inherited from both parents
- Can be passed on passed on from 2 parents who don't have it themselves as they could be carriers
- caused by a recessive allele
- cystic fibrosis
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