A Wing spots painted out B Wing spots visible; wings silenced C Wing spots painted out; wings silenced D Wings painted but spots visible F Wings painted, spots visible; wings cut, not silenced Peacock butterfly experiment A With wings folded, a peacock butterfly resembles a dead leaf, so it is appropriately camouflaged from predatory birds.
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.
Peacock Butterfly Predator Defenses The photographs below represent the
experimental and control groups used in the peacock butterfly experiment discussed
in Section 1.6. See if you can identify the experimental groups and match them up
with the relevant control group(s). Hint: Identify which variable is being tested in each
group (each variable has a control).
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