There is nothing else added therefore we can’t answer the question.
Answer:
E. By presence of paired homologous chromosomes in the meiotic cell.
Explanation:
Differences between Mitotic Prophase and Prophase 1 of Meiosis:
- The prophase of mitosis is relatively shorter than prophase 1 of meiosis.
- Prophase of mitosis is characterized by the disintegration of the nuclear membrane and the movement of the duplicated centrioles towards the two poles of the cell.
- Prophase 1 of meiosis is relatively longer and involves a number of consecutive events that do not occur in the mitotic prophase.
- Prophase 1 of meiosis involves the disintegration of the nuclear membrane as well. But the most important event of this phase is the pairing of homologous chromosomes through a connection called a synapse. This is called chiasmata formation. Homologous chromosomes pair up in form of tetrads and exchange segments with each other. This process is called crossing over and it is crucial in the production of genetically varied daughter cells.
One of the key characteristics of osteoblasts, osteocytes, and osteoclasts is that they do not undergo mitosis. only germ cells undergo meiosis.
Answer:
True.
Explanation:
The life of a plant alternates between haploid and diploid generations. From a fully matured diploid plant (2n) which is known as sporophytic generation a lot of spores which are haploid are produced by the process of meiosis. By the process of mitosis, these spores then develop into new multi-cellular plant which is also haploid just like spores (n), this phase of plant life cycle is known as gametophytic phase. This haploid plant is capable of producing gametes (n) which are also haploid. When two such gametes from the same or different plant fuse with each other a diploid cell is produced which is known as zygote (2n). This zygote subsequently divides and grows into a diploid plant which is a part of sporophytic generation. This is how the entire life cycle of various plants alternate between gametophytic and sporophytic phase.
This diploid plant then later again produces spores and the cycle of reproduction goes on in the same manner as described above.
Answer:
Option (C).
Explanation:
VEGF (Vascular endothelial growth factor) acts as a signalling molecule for the platelet derived growth factors. Paracrine signalling helps in the cell communication of the near by cells.
VEGF can acts as the paracrine signalling molecule. They have the ability to binds with receptor and can cause the formation of new blood vessels to their by neighbor cells also.
Thus, the correct answer is option (C).
