Flashcards
National 5 Biology-Variation and Inheritance
Cards in this deck (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.
Information
- Description
- CfE Higher Biology (Unit 3-Multicellular Organisms) Flashcards on National 5 Biology-Variation and Inheritance, created by NinaJasT on 14/04/2015.
- Created by
- NinaJasT · Apr 2015
- Updated
- Feb 19, 2016
- Views
- 125
- Rating