Question

Match column-I with column-II and select the correct answer using the codes given below:

	Column-I (Name of the organism)		Column-II (Chromosome number in meiocyte) (2n)
A.	Housefly	I.	20
B.	Fruit fly	II.	34
C.	Apple	III.	8
D.	Maize	IV.	12

A. A-II, B-III, C-IV, D-I
B. A-III, B-IV, C-II, D-I
C. A-IV, B-III, C-I, D-II
D. A-IV, B-III, C-II, D-I

Answer 1

Hint: Chromosomes are thread-like structures that are found within the nucleus of animal and plant cells. Protein and a single molecule of deoxyribonucleic acid make up each chromosome (DNA). Meiocytes are diploid in nature. The number of chromosomes in meiocytes and somatic cells is the same.

Complete Step by Step Answer:
A meiocyte is a sort of cell that undergoes meiosis and develops into a gamete. The diploid meiocyte separates into four genetically distinct haploid gametes during meiosis. The control of the meiocyte through the meiotic cell cycle differs between organisms.
A meiocyte has the same number of chromosomes as a somatic cell. A somatic cell in a housefly contains 12 chromosomes. As a result, meiocytes have 12 chromosomes. Similarly, in the fruit fly, it is 8. After meiosis, the apple meiocyte contains 34 chromosomes, and the gamete consists of 17 chromosomes. The chromosome number in maize diploid meiocytes (2n) seems to be 20.

Additional information: Each cell's nucleus contains the chromosome, which is packaged into thread-like structures. Each chromosome is made up of DNA tightly coiled around special proteins known as histones. Under a microscope, chromosomes are typically invisible. They are only viewable during the process of cell division.
The correct option is D.



Note: The role of chromosomal recombination during meiosis and subsequent sexual reproduction in genetic diversity is significant. Meiocyte division, which leads to gamete formation, is strictly regulated. Control differs between organisms. In yeast and humans, these checkpoints eliminate any mutants, and the cell cycle does not progress further. These meiotic cell cycle checkpoints do not exist in plants, and mutant cells complete meiosis to produce defective microspores.