Question

Select the incorrect match :

• A. Submetacentric chromososmes- L- shaped chromososmes
• B. Lampbrush chromososmes- diplotene bivalents
• C. Polytene chromososmes- oocytes of amphibians
• D. Allosomes- sex chromososmes

Answer 1

The correct option is C Polytene chromososmes- oocytes of amphibians

a) There are four types of chromosomes based on the position of centromere. These are metacentric, submetacentric, acrocentric and telocentric. Submetacentric chromosomes are L-shaped as in these chromosomes one arm is short and other arm is long.

b) Lampbrush chromosomes are special type of chromosomes that are found in the immature eggs of many animals like amphibian oocytes but not in mammals. These are formed during the diplotene stage of meiotic prophase I. They are bivalent, that is made up of two conjugating homologues.

c) Polytene chromosomes are giant chromosomes. They are commonly seen in two-winged flies. They result due to repeated rounds of DNA replication without any cell division.

d) Chromosomes are of two types, allosomes and autosomes. Allosomes are sex chromosomes. In human, these are of two types, X and Y.

Thus, the correct answer is option C.