Answer: Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism's offspring).
By the end of meiosis, the resulting reproductive cells, or gametes, each have 23 genetically unique chromosomes. The overall process of meiosis produces four daughter cells from one single parent cell.
Explanation:
During meiosis, homologous chromosomes (1 from each parent) pair along their lengths. The chromosomes cross over at points called chiasma. At each chiasma, the chromosomes break and rejoin, trading some of their genes. This recombination results in genetic variation.
Answer:
Nutrition. This means the science of food and the nutrients and other substance they contain and their actions within the body while nutrients means chemical substances that are obtained from foods and provide nourishment essential for the maintenance of life and for growth.
Explanation:
Answer:
This can be explained based on structure, and on metabolisms of carbohydrate.
Explanation:
Carbohydrate has a relatively simple structural composition than the either protein or fatty acids. The C, H and Oxygen molecules are of relatively fewer in number and few chains than fats and protein.Thus cells will spend less energy to break bonds(catabolisims) among these molecules during cellular respiration pathways to trap the energy.
In addition glucose the end products of carbohydrate did not need any processing before it enters glycolysis, Kreb's Cycle and oxidative phosphorylation pathways to generate energy for the cells.
Conversely, for protein to be used it has to be first deaminated(removal of amino acid) by the liver before it enters glycolysis,while fats needs to be broken down and undergo beta oxidation with the long chains removed before it can form acetyl CoA. Therefore cells will prefer few steps, less endergonic pathways of glucose than longer more endergonic amino acids and fatty acid pathways.
Furthermore, glucose can be used in cellular respiration to produce energy either aerobically or anaerobically, while fats can only be used anaerobically. Therefore, since cells usually prefer to thrive in aerobic conditions they breakdown glucose easily during this period, and when lack of oxygen occurs they switched to anaerobic, Thus, the versatility of glucose to oxygen concentration makes glucose a better choice. Besides if fats was used anaerobically, ketone bodies build up which may be toxic to the cells.
The niche is considered an animals role in an environment. It describes not only the habitat that the animal lives in, but what the organism does within the habitat. All abiotic and biotic factors are included in a niche, including abiotic factors like the temperature the organism can survive in, as well as the amount of sunlight and water needed for the organism to survive. Biotic factors include what the food source is for the organism, and the predators of the organism.
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Answer:
Please see below
Explanation:
The number of chromatids have been stated with the respective event when it occurs in that particular number in the following way:
<u>23 chromatids</u>
primary oocyte arrested prior to ovulation
spermatozoa
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<u>46 chromatids</u>
oogonium prior to S phase
<u>92 chromatids</u>
secondary polar body
