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Which of the following is incorrectly pa...

Which of the following is incorrectly paired?
(a) sry gene- X chromosome
(b) 2n-2- Nullisome
(c) Nucleoid- prokaryote
(d) Polytene chromosome -Drosophila

A

sry gene- X chromosome

B

2n-2- Nullisome

C

Nucleoid- prokaryote

D

Polytene chromosome -Drosophila

Text Solution

AI Generated Solution

The correct Answer is:
To determine which of the following pairs is incorrectly matched, we will analyze each option one by one. ### Step-by-Step Solution: 1. **Option (a): sry gene - X chromosome** - The SRY (Sex-determining Region Y) gene is responsible for the development of male characteristics in humans and is located on the Y chromosome, not the X chromosome. Therefore, this pairing is incorrect. 2. **Option (b): 2n-2 - Nullisome** - A nullisome refers to a condition where a pair of homologous chromosomes is missing. In this case, if we have a diploid organism (2n), and two chromosomes are missing, it would indeed be represented as 2n-2. Thus, this pairing is correct. 3. **Option (c): Nucleoid - prokaryote** - The nucleoid is the region in prokaryotic cells where the genetic material (DNA) is located. It is not enclosed by a membrane, which is characteristic of prokaryotes. Therefore, this pairing is correct. 4. **Option (d): Polytene chromosome - Drosophila** - Polytene chromosomes are large chromosomes that are found in the salivary glands of Drosophila (fruit flies). This pairing is also correct. ### Conclusion: After analyzing all the options, we find that the incorrect pairing is **(a) sry gene - X chromosome**. The SRY gene is located on the Y chromosome, not the X chromosome. ---
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