d t. A lobster with a tt genotype has a tail length of 2 feet. A lobster with a genotype of Tt has a tail length of 3 feet. And a lobster with a TT genotype has a tail length of 4 feet. Based on this information the genetic variation at this locus is best described as what
Genetic Variation
Genetic variation refers to the variation in the genome sequences between individual organisms of a species. Individual differences or population differences can both be referred to as genetic variations. It is primarily caused by mutation, but other factors such as genetic drift and sexual reproduction also play a major role.
Quantitative Genetics
Quantitative genetics is the part of genetics that deals with the continuous trait, where the expression of various genes influences the phenotypes. Thus genes are expressed together to produce a trait with continuous variability. This is unlike the classical traits or qualitative traits, where each trait is controlled by the expression of a single or very few genes to produce a discontinuous variation.
Imagine you are studying tail length in giant lobsters. You discover that one genetic locus influences tail length. The alleles at the locus are T and t. A lobster with a tt genotype has a tail length of 2 feet. A lobster with a genotype of Tt has a tail length of 3 feet. And a lobster with a TT genotype has a tail length of 4 feet. Based on this information the
| a. |
Additive genetic variation |
|
| b. |
Dominant genetic variation |
|
| c. |
Environmental genetic variation |
|
| d. |
Fixed genetic variation |
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