The correct answer is option C, Mutations have arisen that may have altered allele frequencies
There have been several instances where mutation in the gene of an insect is caused due to the harmful external environmental condition which are either created or occurs naturally. Usually, the organisms evolve themselves to sustain in an adverse environment condition. In the process of evolution, they go through the process of positive genetic mutation but sometimes the mutation may also produce negative effect on the DNA of an species through wrong or inefficient pairing/coding. Here in this case it can be stated that the chemical sprayed on insects might have attacked the gene pool of the insects thereby producing adverse genetic mutation.
Answer: The correct statements are a, c, and e.
Explanation:
Oogenesis is the process by which ovum or female gamete is formed.
The process of oogenesis initiates in a female during her fetal stages. During embryonic stage, the oogonium (2n) or stem cells divide and mature into primary oocyte (2n) with the help of mitotic division.
Primary oocyte starts its meiotic division but gets arrested in prophase I stage before birth. After puberty, one oocyte resumes the division each month till menopause.
The primary oocyte completes the first meiotic division and produce secondary oocyte (n) and one polar body. The polar body is usually small in size and gets degenerated with time. It may or may not complete its meiosis II.
The first meiotic division is usually completed one day before ovulation (not just prior to ovulation).
Secondary oocyte is released during ovulation. It undergoes meiosis II but gets arrested in metaphase II. It does not complete its meiosis II until fertilized by a sperm.
Once, sperm penetrates the secondary oocyte, it resumes and completes its second division. It releases second polar body which also gets degenerated.
Thus, the correct statements are a, c, and e.
It is known as facilitated transportation .
The correct option is (A) to fuel their chemical reactions
A lot of biochemical reactions occur per minute inside living cells and these reactions have to be sustained because the survival of living cells depend on them. For these reactions to proceed, energy is needed. This energy is usually obtained from the food which a living organism consumed. The mitochondria, which is the power house of the cell, is the one which convert the energy to the ATP form, which is usable by the cells.
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