PATHOLOGY MCQ
GENETICS AND DISEASE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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The pigment in butterfly wings absorbs light from the environment.
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The phenotypic expression of wing shape depends on color pigmentation in butterflies.
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The genes regulating wing color in butterflies are influenced by environmental factors.
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Caterpillars exposed to red and green light are healthier than caterpillars exposed to no light or blue light.
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Detailed explanation-1: -Morgan discovered a mutation that affected fly eye color. He observed that the mutation was inherited differently by male and female flies. Based on the inheritance pattern, Morgan concluded that the eye color gene must be located on the X chromosome.
Detailed explanation-2: -For example, in 1917, biologist Thomas Hunt Morgan conducted studies in which he placed Vanessa urtica and Vanessa io caterpillars under red, green, or blue light, while other caterpillars were kept in the dark.
Detailed explanation-3: -Work. By conducting statistical studies of the way genetic traits are passed on in fruit flies, Thomas Hunt Morgan broke new ground in genetics during the first decade of the 20th century. His work confirmed that genes are stored in chromosomes inside cell nuclei.
Detailed explanation-4: -Morgan began breeding the white-eyed mutant fly and found that in one generation of flies, the trait was only present in males. Through more breeding analysis, Morgan found that the genetic factor controlling eye color in the flies was on the same chromosome that determined sex.