Question

Select the incorrect match.

• A. Allosomes – sex chromosomes
• B. Submetacentric chromosomes – L-shaped chromosomes
• C. Polytene chromosomes – oocytes of amphibians
• D. Lamp brush chromosomes – Diplotene bivalents

Answer 1

The correct option is C

Polytene chromosomes – oocytes of amphibians

The correct option is C.

Explanation of the correct option:

Option C:

1. Polytene chromosomes are extremely large chromosomes.
2. They are frequently observed in two-winged flies.
3. They are caused by repeated rounds of DNA replication in the absence of cell division.

Explanation of the incorrect options:

Option A:

1. Allosomes and autosomes are the two types of chromosomes.
2. Sex chromosomes are allosomes.
3. These are classified into two types in humans: X and Y.

Option B:

1. Based on the position of the centromere, chromosomes are classified into four types.
2. Metacentric, submetacentric, acrocentric, and telocentric are the four types.
3. Submetacentric chromosomes are L-shaped, with one arm being short and the other being long.

Option D:

1. Lampbrush chromosomes are a type of chromosome found in many animal's immature eggs, such as amphibian oocytes, but not in mammals.
2. These are formed during the meiotic prophase I's diplotene stage.
3. They are bivalent, which means they contain two conjugating homologs.

Final answer: The incorrect match is polytene chromosomes – oocytes of amphibians.