Question

HELP ASAP BEING TIMED WILL MARK BRAINLEIST!!!!!!!!!!!!!

The results of Thomas Hunt Morgan’s last cross are shown in the Punnett square below.


Which of Thomas Hunt Morgan's hypotheses was valid based on these results?

A. White eyes are lethal in female Drosophila.

B. White eyes are lethal in male Drosophila.

C. Female Drosophila with white eyes are homozygous recessive.

D. White eyes are the dominant trait in female Drosophila.

Answer 1

The correct option will be B. White eyes are lethal in male Drosophila. Thomas Hunt Morgan's hypotheses were valid based on the results of White-eyes being lethal in male Drosophila.

• In the year 1910 Thomas Hunt Morgan performed an experiment in New York which helped to identify the roles that chromosomes played in heredity.
• That year Morgan bred fruit flies or Drosophila and after observing thousands that has red eyes he was able to identify the ones that had white eyes.
• In his observation, he noticed that the controlling eye color was located in the X chromosome.
• Female drosophilas have two X chromosomes while the male chromosome has only one X chromosome.
• Morgan called this the X-linked trait as it was only lined with the X chromosome.
• In his experiment, the males displayed the white eye trait as it was present in their only X chromosome, and this was not displayed by the females.

• Therefore, from the above, we can infer that the answer is  B. White eyes are lethal in male Drosophila.

#SPJ2

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