Cloning is the process of creating genetically identical offspring. Organisms that make clones of themselves do so through asexual reproduction. This involves just one organism. Sexual reproduction, on the other hand, creates genetically distinct offspring from two parents. Sexual reproduction creates diversity within a population by means of having distinct offspring. Cloning necessitates genetically identical offspring (save for a few mutations), and thus is incompatible with sexual reproduction.
In sexual reproduction, the male gamete contributes half of the genetic material. A spermatozoon contributes exactly 23 chromosomes, while an ovum contributes exactly 23 chromosomes.
Answer:
lead pencils (graphite)
fertilizer (potassium, sodium, calcium)
chalk (gypsum)
flashbulb (zirconium)
window glass/mirrors (silica)
table salt (halite)
Explanation:
Environmental factors typically activate genes in a cell by causing the cell to transcribe specific DNA segments to mRNA for translation.
This interaction is an example of environmental factors affecting <u><em>genetic expression</em></u>. In these situations, the environment causes specific segments of DNA to be expressed, meaning they are transcribed to mRNA and subsequently used to form proteins.
Meanwhile, other parts of the genome remain or are forced to be silent. This can be a result of mutations or simple biochemical reactions between the environment and the genome.
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Answer:
Darwin proposed the theory of natural selection to explain the process of evolution. According to Darwin’s theory of natural selection, all organisms have the potential to reproduce limitlessly irrespective of the fact that each species maintain a constant density over time. However, the struggle for existence, i.e. the competition among individuals for available resources to survive and reproduce, put a check on species density (D) and maintains it at a constant level (B). Survival of fittest is unequal ability of individuals to survive and reproduce based on suitability of their inherited characters to prevailing environmental conditions (A). It imparts the reproductive advantage to certain organisms which account for major part of the gene pool of the species. Thus, natural selection favors the individual with survival and/or reproductive advantage over others under existing environmental condition (E). Thus, the correct answer is option C.
The correct answer is: D, a decreased number of oxygen-rich mitochondria.
