Flashcards
National 5 Biology-Variation and Inheritance
Flashcards do conjunto (14)
- 1What is variation?Differences that can be seen between individual members of a species.
- 2Explain discrete variationIn discrete variation, differences are clear-cut and fall into distinct groups. Discrete variation is caused by a single-gene inheritance.
- 3Give some examples of discrete variationThe ability to roll one's tongue, eye colour, PTC tasting.
- 4Explain continuous variationIn continuous variation there is a range of variation between the extremes of a characteristic. Continuous variation is caused by a polygenic inheritance (many different genes are involved).
- 5Give some examples of continuous variationBody height in humans and body mass in humans.
- 6Why does discrete variation arise?Because individuals carry different alleles of the discrete genes for a characteristic.
- 7What is the phenotype of an organism?The organism's outward appearance of a characteristic it has, as a result of genetic information inherited from the parents.
- 8What is an allele?Different forms of a gene that produce different phenotypes.
- 9What is the genotype of an organism?A statement of the alleles it has for a characteristic.
- 10What does the genotype code for?The phenotype.
- 11What are dominant alleles?Alleles that always show in the phenotype of an organism that has them.
- 12What are recessive alleles?Alleles that only show themselves in the phenotype if an organism has inherited one from each parent.
- 13What does a homozygous organism have?Two copies of the same allele of a particular gene;one from each parent.
- 14What does a heterozygous organism have?Two different alleles of the same gene;one from each parent.
Informações
- Descrição
- CfE Higher Biology (Unit 3-Multicellular Organisms) FlashCards sobre National 5 Biology-Variation and Inheritance, criado por NinaJasT em 14-04-2015.
- Criado por
- NinaJasT · abr 2015
- Atualizado
- 19 fev 2016
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