WebAnswer: Explanation: When a sperm comes in contact with the zona pellucida layer of the ovum, it induces changes in the membrane of the ovum to block the entry of additional sperms. This thus prevents the polyspermy and ensures that only one sperm can fertilise an ovum. What is the difference between fast block and slow block polyspermy? WebDec 13, 2024 · The compact head, which has lost most of its cytoplasm, is key in the formation of a streamlined shape. The middle piece of the sperm, connecting the head to the tail, contains many mitochondria, providing energy to the cell. The sperm cell essentially contributes only DNA to the zygote. On the other hand, the egg provides the other half of …
Cleavage, blastulation, gastrulation, and neurulation - Khan Academy
WebThe somatic cell cycles discussed so far in this chapter result in diploid daughter cells with identical genetic complements. Meiosis, in contrast, is a specialized kind of cell cycle that reduces the chromosome number by half, resulting in the production of haploid daughter cells. Unicellular eukaryotes, such as yeasts, can undergo meiosis as well as reproducing … WebThis produces a new cell called a zygote, which will mature into an embryo. The number of cells increase by mitosis, and as the embryo develops, the cells begin to differentiate (or … nesc guwahati
What is difference between monospermy and polyspermy?
WebApr 9, 2024 · Accessory organs are the ones that help the primary organs in performing the specific function. Primary organs of the human reproductive system or the primary sex organs of males are a pair of testes and in females, a pair of ovaries. Primary sex organs produce gametes— sperms in males and ovum in females. WebFertilization is a fusion of male and female gametes to produce a zygote. A zygote is a newly fertilized egg that contains the necessary genetic information to make offspring. For example, fertilization takes place when a sperm fuses with an ovum, forming a single cell that can develop into an embryo. WebSo one way to think about it, the gametes are the sex cells that have half the number of chromosomes and the zygote is the cell that's now ready to differentiate into an actual … nesc ground clearance