Master NEET Zoology with topic-wise questions. Tailored for NEET students, these questions strengthen your Biology preparation.
A researcher observes a unicellular organism reproducing asexually. The daughter cells are genetically identical except for a few minor variations. Which mechanism is MOST likely responsible for these variations?
Crossing over during mitosis
Independent assortment of chromosomes
Random mutations during DNA replication
Conjugation with another individual
In a species with a 2n=16 karyotype, how many chromosomes would be present in the nucleus of the functional megaspore?
8
16
32
4
Which of the following events is NOT associated with the process of spermatogenesis?
Formation of a polar body
Differentiation of spermatids into spermatozoa
Meiotic divisions
Release of spermatozoa into the seminiferous tubules
Which process is crucial for introducing variations in sexually reproducing organisms?
Mitosis
Binary fission
Budding
Meiosis
What is the product of meiosis?
Diploid somatic cells
Haploid gametes
Diploid gametes
Haploid somatic cells
During oogenesis, the first meiotic division is completed at which specific stage?
During fetal development
At puberty
Just prior to ovulation
After fertilization
During oogenesis, a primary oocyte is arrested in which stage of meiosis until puberty?
Metaphase II
Prophase I
Anaphase I
Telophase I
During spermatogenesis, a critical step involves the conversion of spermatids into spermatozoa. This intricate process, known as spermiogenesis, includes several key morphological changes. Which of the following is NOT a characteristic feature of spermiogenesis?
Formation of the acrosome
Condensation of the nucleus
Development of the flagellum
Meiotic divisions
During human oogenesis, the first meiotic division is completed at which stage and results in the formation of what?
Puberty; primary oocyte and first polar body
Ovulation; secondary oocyte and first polar body
Fertilization; ovum and second polar body
Embryogenesis; oogonia and polar bodies
A primary spermatocyte with 2n = 46 chromosomes undergoes meiosis. At the end of Meiosis I, what is the chromosome number and DNA content of each resulting cell?
23 chromosomes and 4C DNA content
23 chromosomes and 2C DNA content
46 chromosomes and 4C DNA content
46 chromosomes and 2C DNA content
