. The numbers of chromosomes in the somatic cells ofseveral oat varieties (Avena species) are: sand oats(Avena strigosa)—14; slender wild oats (Avenabarata)—28; and cultivated oats (Avena sativa)—42.a. What is the basic chromosome number (x) in Avena?b. What is the ploidy for each of the different species?c. What is the number of chromosomes in the gametesproduced by each of these oat varieties?d. What is the n number of chromosomes in eachspecies?
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.
. The numbers of chromosomes in the somatic cells of
several oat varieties (Avena species) are: sand oats
(Avena strigosa)—14; slender wild oats (Avena
barata)—28; and cultivated oats (Avena sativa)—42.
a. What is the basic chromosome number (x) in Avena?
b. What is the ploidy for each of the different species?
c. What is the number of chromosomes in the gametes
produced by each of these oat varieties?
d. What is the n number of chromosomes in each
species?
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