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.
Karl and Hally Sax crossed Aegilops cylindrica (2 n = 28), a wild grass found in the Mediterranean region, with Triticum vulgare (2 n = 42), a type of wheat . The resulting F1 plants from this cross had 35 chromosomes. Examination of metaphase I in the F1 plants revealed the presence of 7 pairs of chromosomes (bivalents) and 21 unpaired chromosomes (univalents).
a. What does the appearance of the bivalents in the F1 hybrids suggest about the origin of Triticum vulgare wheat?
![legilops cylindrica, jointed goatgrass. [Sam Brinker, MNR-NHIC,
2008/Canadian Food Inspection Agency.]](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe5a788f5-b348-49a0-aae7-f66ab1256f48%2F58269276-c3d7-4e9f-be1b-99765fdf8358%2Fbd4zecd.jpeg&w=3840&q=75)
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