A food chain shows feeding relations from one organism to another. It usually has 3 to 5 organisms.
A food web shows complex feeding relations among many organisms.
An energy pyramid shows the transfer of energy between organisms.
Answer:
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Answer:
<em>A: Tetrads do not form in prophase II</em>
Explanation:
Prophase I and prophase II are stages in meiosis which is the division of sex cells that results in the production of haploid gametes or daughter cells.
Meiosis involves two successive division. At the end of the first division, two daughter cells are produced while each of the produced daughter cells undergo another division each to give four daughter cells at the end.
Meiosis I involves prophase I, metaphase I, anaphase I, and telophase I while meiosis II involves prophase II, metaphase II, anaphase II, and telophase II respectively.
Prophase I marks the beginning of meiosis and it involves a synapsis of homologous chromosomes to form a 4-chromatids structure known as bivalents or tetrads. On the other hand, prophase II does not involve formation of tetrads, rather, it involves the dissolution of nuclear envelope and formation of spindle. The chromosomes at this stage are not in 4-chromatids but 2 chromatids each.
<em>The correction option is A.</em>
Option A, C, D and E are applied.
<h3><u>Explanation:</u></h3>
Cancer is a disease in humans where there's uncontrolled cell division which doesn't stop in absence of a inhibition.
Cancer cells do show different characteristics which are different from the normal cells. Firstly, they doesn't show contact inhibition. They don't stop dividing inspite of contact with the surrounding cell from each side. This results in the Tumour or nodule formation.
Secondly, they secrete factors which supports growth of new blood vessels around the tumours. They are called angiogenesis promoting factors.
Thirdly, they divide very rapidly, much higher than normal cells. So the biopsy slide with frequent mitotic figures are very common. And these cells lack telomerase, which leads them to live much longer than what is expected lifespan of a normal cell. They don't even need a growth signal for their division.