Meiosis is the reductional division which takes place in organisms which reproduce by the process of sexual reproduction. It produces haploid cells to maintain the chromosome number constant in the offpsring.
Meiosis is a type of cell division which results in the reduction of chromosome number in the cell by half of its original number. Meiosis is also known as reductional division.
Meiosis takes place in the process of formation of gametes in the organisms which reproduce by sexual mode of reproduction. In meiosis, four daughter cells are produced, which are haploid. The male and female gametes produced by meiosis under fertilization to form zygote which is diploid. If the gametes were not haploid then the offspring will show presence of extra set of chromosome which can lead to chromosomal disorders.
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Answer:
The overall process of meiosis produces four daughter cells from one single parent cell. Each daughter cell is haploid, because it has half the number of chromosomes as the original parent cell. "Meiosis is reductional," said M.
Answer:
The nitrogenous bases Adenine (A), pairs with uracil (U), while guanine (G) and cytosine (C) pair up.
Explanation:
Nucleotides are monomers that make up DNA and RNA- these are nucleic acids that function as storage, transport and messenger molecules for encoding proteins. Nucleotides contain a 5-carbon deoxyribose (with hydroxyl modifications) or ribose sugar (RNA), phosphate and one of four nitrogenous bases:
Adenine (A)
Guanine (G)
Cytosine (C)
Thymine (T).- DNA only
Uracil (U) found in RNA
Nucleotide monomers derive their names from their bases. Nucleic acid polymers form on a single strand through covalent bonding. This occurs between two nucleotides in an esterification reaction where a phosphodiester bond is formed.
Nitrogenous bases encourage hydrogen bonding, and resulting base pair formation. Adenine (A), pairs with uracil (U), while guanine (G) and cytosine (C) pair up.
B. Cerebellum
C. Brain stem
D. All of the above
The movement of water in plants from the roots to the leaves is driven by transpiration, which creates a tension pulling water upwards. This process, as well as the water's cohesion and adhesion, and differences in water potential, is explained by the cohesion-tension theory.
The movement of water in plants, specifically from the roots to the leaves, is primarily driven by a process known as transpiration. Transpiration is the evaporation of water from the plant's leaf surfaces. This occurs at the leaf-atmosphere interface, creating a negative pressure or tension which effectively pulls up water from the roots, through the xylem vessels.
Adherence of water to the xylem cell walls, known as adhesion, and the attraction between water molecules themselves, known as cohesion, also play significant roles in this process. These factors permit the water to be held in the stem and leaf when transpiration stops at night as the stomata shut. Overall, this process of water movement is described by the cohesion-tension theory of sap ascent.
Water potential, at the same time, affects this process as it decreases from the roots to the top of the plant, meaning, there's a high water potential in the soil and roots and a low potential in the leaves, driving water upwards through the plant.
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