Through the study of unusually shaped chromosomes in
[ Select ]
corn
finches
fruit flies
pea plants
,
[ Select ]
Charles Darwin
Gregor Mendel
Thomas Hunt Morgan
Barbara McClintock
provided strong evidence that genes are located on chromosomes.

Question

Through the study of unusually shaped chromosomes in 
[ Select ]
corn
finches
fruit flies
pea plants
 , 
[ Select ]
Charles Darwin
Gregor Mendel
Thomas Hunt Morgan
Barbara McClintock
 provided strong evidence that genes are located on chromosomes.

BlackTom AI · Accepted Answer

Analyzing the prompt, we must fill two selects: the first between organism options (corn, finches, fruit flies, pea plants) and the second between scientists (Charles Darwin, Gregor Mendel, Thomas Hunt Morgan, Barbara McClintock), based on who provided strong evidence that genes are located on chromosomes.
Option 1 choices (organisms):
- corn: While maize cytogenetics did yield important discoveries about chromosomes, the classic demonstration that genes reside on chromosomes came from work in another organism, so labeling maize as the primary source of that conclusion is not accurate in the historical sense.
- finches: This group is associated with early genetic and chromosomal studies? Not in this context; finches ( Darwinian studies ) are not the standard model for the chromosome theory of inheritance, so this is not the correct match here.
- fruit flies: This is the correct organism in the classic chromosome theory history. Thomas Hunt Morgan used Drosophila melanogaster to show that genes are located on chromosomes and that their sex-linked traits follow chromosomal patterns, providing strong evidence for the chromosomal basis of inheritance.
- pea plants: Mendel worked with pea plants, but his experiments established inheritance patterns before chromosomal theory; peas are not the organism that provided the decisive chromosome-based evidence.
Option 2 choices (scientists):
- Charles Darwin: Not the figure who demonstrated the chromosome location of genes; Darwin proposed natural selection principles, not the chromosome theory of inheritance.
- Gregor Mendel: Founded the basic laws of inheritance using pea plants, but did not provide direct evidence that genes reside on chromosomes.
- Thomas Hunt Morgan: Correct choice for the scientist who provided strong evidence that genes are located on chromosomes, based on his Drosophila experiments and associations with chromosomal sex linkage and recombination.
- Barbara McClintock: A pivotal contributor to maize genetics and transposable elements, her work significantly advanced understanding of genome dynamics, but she did not provide the foundational evidence that genes are located on chromosomes in the sense established by Morgan’s chromosome-theory demonstrations.

Putting the pieces together, the historically supported pairing is: fruit flies with Thomas Hunt Morgan as the scientist who provided strong evidence that genes are located on chromosomes. The answer you supplied, ["corn", "Barbara McClintock"], mixes different traditions: maize research and McClintock’s later work on transposons, which are important but do not constitute the classic, foundational evidence that genes are chromosomal in the way Morgan’s work does. This reflects a common misconception that maize findings alone established chromosome-based inheritance, whereas Morgan’s Drosophila experiments provided the decisive link between genes and chromosomes, and McClintock’s maize studies contributed to understanding genome dynamics rather than the primary chromosome-location claim.

To summarize the core distinctions:
- The organism option that correctly aligns with the historic demonstration is fruit flies, not corn or peas.
- The scientist option that correctly aligns with providing strong chromosome-based evidence is Thomas Hunt Morgan, not Darwin, Mendel, or Barbara McClintock, whose contributions were different in scope.

Therefore, the two correct selections should be: fruit flies for the organism, and Thomas Hunt Morgan for the scientist. All other options misidentify either the model organism or the scientist associated with the classic chromosome theory evidence.

BIOL_2004_81774_202509 Homework 2

Through the study of unusually shaped chromosomes in [ Select ] corn finches fruit flies pea plants , [ Select ] Charles Darwin Gregor Mendel Thomas Hunt Morgan Barbara McClintock provided strong evidence that genes are located on chromosomes.

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