Question

In 1891 Henking discovered a specific nuclear structure and observed that 50% of the sperm received this structure after spermatogenesis. It was

• A. Y chromosome
• B. X body
• C. Autosomes
• D. Polar body

Answer 1

The correct option is B

X body

The correct option is B

Explanation of the correct option:

1. Henking carried out an experiment in 1891 in which he could have a specific nuclear structure throughout spermatogenesis in a few insects.
2. He noticed that 50% of the sperm received this structure, while the other 50% did not.
3. Henking named that edifice but was unable to elaborate on its significance.
4. It appeared to be X-shaped.
5. Later, it was discovered that this X-body was actually the X-chromosome, also known as the sex chromosome.

Explanation of the incorrect option:

Option A:

1. Following Henking's discovery, further research revealed that many other mammals and some insects have an X-chromosome counter that is only found in males and is smaller than the X-chromosome.
2. It was given the name Y-chromosome and is a sex chromosome found in males.

Option C:

Other than sex chromosomes, these are the set of chromosomes that Henking didn't discuss in his experiment.

Option D:

Although they develop during oogenesis alongside the ovum, these tiny haploid cells are incapable of fertilisation.

Final answer: the nuclear structure was X body.