Inheritance
- Created by: Laurenskye
- Created on: 29-03-16 23:14
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- Inheritance
- There are many different genetic disorders.
- Some are caused by a dominant allele, some recessive.
- If the allele is dominant the person only has to inherit only 1 dominant allele to have the disorder.
- An example of a disorder is polydactyly.
- If an allele is recessive the person must inherit 2 recessive alleles to have the disorder.
- An example of a disorder is polydactyly.
- Cystic fibrosis is caused by a recessive allele.
- The allele affects cell membranes and causes the production of thick sticky mucus. The mucus can affect several organs, including the lungs and pancreas.
- A child must inherit a recessive allele from both parents to develop cystic fibrosis.
- The disorder can be passed on from 2 parents who don't have cystic fibrosis, they have to be carriers of the allele.
- A child must inherit a recessive allele from both parents to develop cystic fibrosis.
- The allele affects cell membranes and causes the production of thick sticky mucus. The mucus can affect several organs, including the lungs and pancreas.
- If the allele is dominant the person only has to inherit only 1 dominant allele to have the disorder.
- Some are caused by a dominant allele, some recessive.
- Genetic Diagrams
- By using genetic diagrams it is possible to see how a disorder has been inherited and also to predict whether future offspring will inherit it.
- Homozygous- Both alleles are the same, DD (homozygous dominant) or dd (homozygous recessive)
- An organism can also be Hetrozygous this means that it has two different alleles.
- Humans have 23 pairs of chromosomes one of these are the sex chromosomes. Females have 2 X's and Males have a X and a Y.
- Genes controlling the same characteristics are called alleles. If an allele masks the effect of another it is dominant, if it is being masked then it is recessive.
- A phenotype is the physical appearance of the characteristic
- A genotype is the genetic make up which alleles does the indervidual inherit? DD, Dd or dd
- A phenotype is the physical appearance of the characteristic
- Genes controlling the same characteristics are called alleles. If an allele masks the effect of another it is dominant, if it is being masked then it is recessive.
- There are many different genetic disorders.
- DNA
- Genes are found on chromosomes
- Chromosomes are made of DNA which is a very long molecule with a double Helix
- Genes are short sections of DNA.
- Every individual has different DNA.
- Genes are short sections of DNA.
- Chromosomes are made of DNA which is a very long molecule with a double Helix
- Genes are found on chromosomes
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