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Biology B1.2 A - Explaining inheritance
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- 1How is genetic information passed on?By gametes.
- 2What are gametes?Sex cells: Egg from the mother, Sperm from the father.
- 3What are gametes made from?Body cells.
- 4How many chromosomes do gametes have?They have half the number as body cells - 23
- 5Why do gametes have less chromosomes?So when they meet, the resulting cell has the correct number of chromosomes.
- 6What is point mutation?The difference between 2 variants.
- 7What is a dominant variant?One dominant variant is needed in a pair of alleles to have its feature.
- 8What is a recessive variant?2 recessive variants are needed in a pair of alleged to have its feature.
- 9What does homozygous mean?When a person has 2 alleles that are the same.
- 10What does heterozygous mean?A person has 2 different alleles.
- 11If a parent's genotype is EE, what percentage of there gametes will have the E variant?100%
- 12If a parent has a genotype of Ee, what percentage of gametes will have the E variant?50%
- 13What is a pungent square?A genetic diagram to model possible combinations of genetic variants.
- 14What's another type of a genetic diagram?Family tree.
- 15What is meant by a carrier?Someone who has only one recessive variant. It is not expressed in their phenotype, but they can pass it down to offspring.
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- GCSE Biology (B1 - You & your genes) Karteikarten am Biology B1.2 A - Explaining inheritance, erstellt von lily bevan am 01/12/2017.
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- lily bevan
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