During oogenesis, the reason for arresting an egg at meiosis I is halving the number of chromosomes in a cell, hence making them haploid. When a... View Article
Meiosis I is a reductional division causing the reduction of chromosomes by half while meiosis II is an equational division. As a result, the... View Article
23 chromosomes. Spermatids are haploid, consisting of 23 chromosomes. Spermatids undergo spermiogenesis to become mature spermatozoa. Learn... View Article
A diploid parent cell has two copies of each chromosome. It undergoes meiosis during which one round of DNA replication occurs, followed by two... View Article
Cytoplasm that is not required anymore is either disposed of in the lumen of tubules or phagocytized by cells of Sertoli. However, a clump of... View Article
Through the process of spermatogenesis, haploid spermatozoa develop in the seminiferous tubules of the testis from germ cells. At birth, these... View Article
Spermatogenesis gives rise to spermatids (n) from spermatogonia (2n). The metamorphosis of spermatids into sperm is spermiogenesis. The sequence... View Article
LH, FSH, and testosterone all indirectly or directly trigger testosterone secretion and the process of spermatogenesis. In this process, haploid... View Article
Spermatogenesis is initiated in the male testis on the onset of puberty. The reason why spermatogenesis does not take place before the onset of... View Article
Enzymes are said to be denatured when they are not active any more and cannot function. Important influences on the enzymatic activity are:... View Article
Two functions of cell membrane are - Serves as a barrier separating the cell constituents from the unwanted substances Selectively permeable... View Article
Prokaryotes are single celled, microscopic entities. They neither have specialized organelles nor a prominent nucleus with a membrane. Examples... View Article
Two examples of osmosis are - Kidney dialysis Roots absorbing minerals and water from the soil Raisin swells when kept in water Also see:... View Article
Fungi are non-vascular, eukaryotes, non-motile and heterotrophic organisms. Examples of fungi are rusts, yeasts, molds, stinkhorns, truffles, and... View Article
Two Characteristics Of Protists are - They are eukaryotes, and can be parasites They locomote using cilia and flagella. A few of them have... View Article
Two characteristics of flowering plants are - Flowering plants have tiny pollen grains which disperse genetic information from one to another... View Article
Some animals which do not possess a heart are jellyfish, sea cucumber, coral etc. Some of the animals can live their lives without a heart to... View Article
Leech has 32 brains. A leech's internal structure is segregated into 32 separate segments, and each of these segments has its own brain. Leech... View Article
It is a mode of experimenting wherein a foreign gene is introduced into the organism's genome. After this, a germ-line transmission of genes... View Article
