Phenotype variation is slight variations in a phenotype that are caused by the expression of an organism's genes or the influence of environmental factors. A species can have several different phenotypes within it.
Phenotype variation is differences within a species that are not enough to consider it a different species altogether. One example of this is differences in coloration in birds of the same species or human blood types.
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Changes that are genetic
Continuous Variation and Discontinuous Variation.
It is a continuous variation which is not by birth. It is an injury which will slowly change so a scar is a continuous variation.
Polygenic.
Lakes usually have the least variation in salinity.
continuous variation.
There are two choices that produce the least phenotypic variation. AA times aa produces only Aa offspring. AA times Aa produces and AA and Aa offspring.
In codominance, both alleles are expressed fully in the heterozygous individual. This results in a phenotype where both traits are visibly expressed, rather than blending together. An example of codominance is when a red flower and a white flower produce offspring with red and white patches.
Genotypic variation is caused by mutation. Phenotypic variation can be caused by mutation, which gives rise to different alleles, or it can be caused by environmental factors.
Broad sense heritability A.K.A (H) is the degree in which phenotypic variation is due to genetic factors Narrow sense heritability A.K.A (h) is the degree in which phenotypic variation is due to additive genetic factors. in maths terms... H = Vg/Vt h = Va/Vt Vg= genetic varaition Vt = total variation Va = additive variation
Gregor Mendel was the father of heredity. His experiments with pea plants established principles of dominance and recessiveness in phenotypic variation.
Heritability is the proportion of Phenotypic variation in a population that is attributable to genetic variation among individuals. Phenotypic variation among individuals may be due to genetic and/or enviromental factors. Heritability analyses estimate the relative contributions of differences in genetic and non-genetic factors to the total phenotypic variance in a population.
Look at a population of humans. Your class will do. Now, how many different heights, hair colors and other assorted phenotypic variations can you see in this small population?This is the frequency of alleles of these types that we call natural variation.
There are hundereds of cheese types. These can all vary depending on the area/district/country you are in. Cheeses all have different varieties as it can depend on the producer.
Changes that are genetic
The phenotypic ratio of the offspring when a tall man marries a short woman is 3:1 (tall/short). The phenotypic ratio is figured by using the punnet square with the dominant allele for tall and the recessive allele for the short gene.
Phenotypic ratio: 3 D, 1d [3 dominant, 1 recessive] Genotypic ratio: 1DD, 2Dd, 1dd