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KA 5 inheritance
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1Variation exists among the members of the same species. When a characteristic can be used to divide the species into distinct groups, it is said to show [blank_start]discrete[blank_end] variation. When the characteristic varies in an [blank_start]uninterrupted[blank_end] way from one extreme to the other, it is said to show [blank_start]continuous[blank_end] variation.
An organism's physical characteristics are known collectively as it's [blank_start]phenotype[blank_end].
Each inherited characteristic is controlled by one or more units of heredity called [blank_start]genes[blank_end]. Each gene is part of a [blank_start]chromosome[blank_end].
Each gene normally has two or more different forms called [blank_start]alleles[blank_end]. An allele that shows it's effect and masks the presence of the other form is said to be [blank_start]dominant[blank_end]. An allele that is masked by the dominant form is said to be [blank_start]recessive[blank_end].
The complete set of genes possessed by an organism is called it's [blank_start]genotype[blank_end]. The genotype of an organism with identical alleles of a gene is described as [blank_start]homozygous[blank_end]. The genotype of an organism with two different alleles of a gene is described as [blank_start]heterozygous[blank_end] .
A characteristic that shows continuous variation controlled by alleles of [blank_start]more[blank_end] than one gene is said to show [blank_start]polygenic[blank_end] inheritance.
A pattern of inheritance among the members of a family can be established by constructing a family [blank_start]tree[blank_end]. Analysis of a family tree relating to genetic disorder enables a genetic [blank_start]councillor[blank_end] to help people make decisions about parenthood based on an assessment of [blank_start]risk[blank_end].- Aalleles
- Bchromosome
- Ccontinuous
- Dcouncillor
- Ediscrete
- Fdominant
- Ggenes
- Hgenotype
- Iheterozygous
- Jhomozygous
- Kmore
- Lphenotype
- Mpolygenic
- Nrecessive
- Orisk
- Ptree
- Quninterrupted
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- Description
- National 5 Biology (Unit 2) Quiz on KA 5 inheritance , created by Rosa Donaldson on 11/12/2015.
- Author
- Rosa Donaldson
- Language
- English
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