Question

In Morgan’s experiments on Drosophila linkage, the percentage of white-eyed, yellow body recombinants and the percentage of white-eyed, miniature winged recombinants in F\textsubscript{2 generation respectively:}

• A. 37.2\% and 1.3\%
• B. \textbf{1.3\% and 37.2\%}
• C. 62.8\% and 37.2\%
• D. 98.7\% and 1.3\%
  \

Hint:

In linkage experiments, genes that are closer together on a chromosome have a lower recombination frequency, while genes that are farther apart exhibit higher recombination rates. In Morgan's Drosophila study, white-eyed and yellow-body genes showed strong linkage (1.3\% recombination), while white-eyed and miniature-wing genes exhibited weaker linkage (37.2\% recombination).

Answer 1

The Correct Option is B

Understanding Morgan’s experiment on Drosophila linkage
- Thomas Hunt Morgan performed experiments on Drosophila melanogaster to study linkage and recombination.
- In his experiment, he analyzed the inheritance of white eyes, yellow body, and miniature wings in fruit flies.
Understanding recombination percentages
- White-eyed, yellow body recombinants were observed at 1.3\%, indicating strong linkage between these genes.
- White-eyed, miniature-winged recombinants were observed at 37.2\%, showing less linkage, meaning a higher recombination frequency.
Examining the given options
- Option 1 (37.2\% and 1.3\%) → Incorrect (values are swapped).
- Option 2 (1.3\% and 37.2\%) → Correct, as it matches the experimental results.
- Option 3 (62.8\% and 37.2\%) → Incorrect (incorrect recombination percentage).
- Option 4 (98.7\% and 1.3\%) → Incorrect (wrong percentage values).
Conclusion
Since the correct recombination percentages are 1.3\% for white-eyed, yellow body recombinants and 37.2\% for white-eyed, miniature-winged recombinants, the correct answer is Option (2).