In examining a large sample of yeast colonies on a petridish, a geneticist finds an abnormal-looking colonythat is very small. This small colony was crossed withwild type, and products of meiosis (ascospores) werespread on a plate to produce colonies. In total, therewere 188 wild-type (normal-size) colonies and 180small ones.a. What can be deduced from these results regardingthe inheritance of the small-colony phenotype? (Inventgenetic symbols.)b. What would an ascus from this cross look like?
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.
In examining a large sample of yeast colonies on a petri
dish, a geneticist finds an abnormal-looking colony
that is very small. This small colony was crossed with
wild type, and products of meiosis (ascospores) were
spread on a plate to produce colonies. In total, there
were 188 wild-type (normal-size) colonies and 180
small ones.
a. What can be deduced from these results regarding
the inheritance of the small-colony
genetic symbols.)
b. What would an ascus from this cross look like?
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