AP BIOLOGY

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THE MOLECULAR BASIS OF INHERITANCE

DNA MAKES RNA MAKES PROTEIN

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
In 1917 the biologist Thomas Hunt Morgan conducted studies in which he kept some caterpillars in the dark and placed some others under red, green, or blue lights. Exposure to red light produced butterflies with brightly colored wings. Exposure to green light resulted in dark-colored wings. Exposure to blue light or no light resulted in pale-colored wings. What was the most likely conclusion of Morgan’s research?
A
The pigment in butterfly wings absorbs light from the environment.
B
The phenotypic expression of wing shape depends on color pigmentation in butterflies.
C
The genes regulating wing color in butterflies are influenced by environmental factors.
D
Caterpillars exposed to red and green light are healthier than caterpillars exposed to no light or blue light.
Explanation: 

Detailed explanation-1: -His work confirmed that genes are stored in chromosomes inside cell nuclei. He came to understand that genes are organized in a long row inside chromosomes and how traits related to each other correspond to genes that lie close to one another on the chromosomes.

Detailed explanation-2: -What did Thomas Hunt Morgan discover that seemed to violate Mendel’s principles? Thomas Morgan discovered that some genes appeared to be linked; This seemed to violate the principle of independent assortment.

Detailed explanation-3: -Which of the following results of Thomas Hunt Morgan’s experiments with white-eyed mutant flies was unexpected in light of Mendelian genetics? Among the F2 progeny, only males had white eyes.

Detailed explanation-4: -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.

There is 1 question to complete.
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