Biology [1 Mark Question Answer]

Polytene chromosome: In salivary glands of fly Larve.

Chromosomes: In the nucleus, mitochondria, and chloroplast.

Cell plate: In the center of the cell.

Asters: Around the centriole at each pole

It inhibits the formation of the mitotic spindles.

Crossing-over, in which genes are transferred from one part to another.

Support chromosomes at the time of cell division.

Heredity, i.e., the transmission of characters from parents to offsprings.

The gametes are produced as a result of meiosis hence they have haploid number of chromosomes.

Centriole (Centrosome).

Every cell capable of cell division passes through different stages or phases in a cyclic maimer. It is called the cell cycle.

In our body meiosis occurs in germ cells i.e. in gonads.

The mitotic cell division occurs in somatic cells of the body.

he meiosis is important to maintain the constant number of chromosomes in a species. It also brings about variations which result in the evolution or origin of new species

The gametes are formed by meiosis. During meiosis the number of chromosomes is reduced to half i.e. the gametes contain haploid number of chromosomes. The male and female gametes fuse to form a diploid zygote. In this way meiosis maintains chromosome number in a species.

The meiosis is referred to as reduction division because the number of chromosomes in the daughter cells is half than that of the mother cell.

During cell division karyokinesis (a division of the nucleus) is followed by the division of cytoplasm It is called cytokinesis. Or in other words, cytokinesis is the division of cytoplasm.

Chromosome

Centrioles

Metaphase

Mitosis

Mitosis

Somatic cells

Mitosis, Meiosis

Cancer

Telophase

Amitosis

Metacentric

Telophase

Centromere

pachytene

Anaphase

Metaphase

Prophase

Meiosis

Crossing-over

Meiosis

Cell division

Karyokinesis

Cytokinesis

Anaphase

Centromere

Interphase

Anaphase

Anaphase

Interkinesis

Gamete formation

Metaphase II

Telophase 1

Late prophase or early Metaphase