Question

Meiocytes are observed in all except:
A. Human egg
B. Blue-green algae
C. Equisetum
D. Dicot plant

Answer 1

Hint: A meiocyte is a form of cell that goes through meiosis to become a gamete. The diploid meiocyte splits into four genetically distinct haploid gametes during meiosis. It's more of a diploid cell. Blue-Green Algae are a form of photosynthetic bacteria that can be single cells or colonies and are also known as Cyanobacteria.

Complete Step by Step Answer:
Meiocytes are the cells that go through meiosis in order to produce gametes. After meiosis or reduction division, they make four haploid cells. They are also referred to as gamete mother cells.

Meiocyte division, which leads to gamete formation, is strictly regulated. Control differs between organisms. In yeast and humans, these checkpoints eliminate any mutants, and the cell cycle does not progress further. These meiotic cell cycle checkpoints do not happen in plants, and mutant cells complete meiosis to generate defective microspores.

Only the absence of meiocytes has been observed in Blue-Green Algae. Now, blue-green algae or cyanobacteria are essentially unicellular, with binary fission being the most common multiplication method. Binary fission is the method by which asexual reproduction takes place in bacteria. A single organism splits into two independent organisms during binary fission. As a result, Blue-Green Algae is an exception.

In botany, the Equisetum is most typically related to ferns. Equisetum, like ferns, does not produce seeds and instead reproduces sexually through spore formation. Spores, on the other hand, are not as important in the spread of equisetum. Meiocytes are also observed in the equisetum.

The correct option is B.


Note: It is to be noted that the ovaries' precursor cells, commonly referred to as eggs, are diploid. During the oogenesis process, diploid cells undergo a process called meiosis and become haploid. All somatic (body) cells in humans are diploid. It implies that the human egg consists of meiocytes. A dicot is a type of flowering plant. Dicotyledon plants are another name for dicot plants. The embryos consist of a pair ( two) of cotyledons. Thus, meiocytes are also observed in dicot plants.