Unit 2-Variation And Inheritance Flashcards
Differences between all the individuals in a species
Variation
Type of variation in which there are two or more distinct groups, with no values in between
Discrete variation
Type of variation in which there is a wide range of values
Continuous variation
Example of discrete variation
Eye colour Blood Type Hair Colour
Example of continuous variation
Height Shoe size Hand Span
Term for several genes working together to produce continuous variation
Polygenic
Short section of a chromosome that has the genetic information for a particular characteristic
Gene
Different forms of a gene
Allele
The most common type of variation
Polygenic and continuous
The appearance of an organism for a characteristic
Phenotype
Alleles an organism has for a particular characteristic - usually written as capital or small letters
Genotype
Allele whose effect always shows in the phenotype
Dominant
Allele which is not dominant - its effect only shows when the cell does not have a dominant allele
Recessive
When an individual has the same alleles for a characteristic (bb or BB)
Homozygous
One dominant and one recessive allele for a feature
Heterozygous
