Answer:
Helper T cells are activated when they bind to their target antigen being displayed on an antigen-presenting cell. These cells then release what chemical? Cytokines, which is a chemical that signals B cells and other T cells to activate.
<span>The answer is 1/8. Let's separate two traits. We have two events occurring together so using multiplication rule we will multiply probabilities of those events. Event 1: the probability that the offspring will show Yy genotype. In the cross of parents Yy and Yy, one of four offspring will have YY genotype, two of four offspring will have Yy genotype, and one of four offspring will have yy genotype. Thus, the probability that the offspring will show Yy genotype is 2/4. Event 2: the probability that the offspring will show TT genotype. In the cross of parents Tt and Tt, one of four offspring will have TT genotype, two of four offspring will have Tt genotype, and one of four offspring will have tt genotype. Thus, the probability that the offspring will show TT genotype is 1/4. Hence, the probability that the offspring will show YyTT genotype is: 2/4 * 1/4 = 2/16 = 1/8.</span>
Since the blood is moving out of the heart by the left ventricle and aorta the blood needs to get pumped and circulated through the heart. More it contracts the better circulation of blood throughout the body!
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The production of new living organisms by combining genetic information from two individuals of different types (sexes).
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The larynx (plural larynges), colloquially known as the voice box, is an organ in our neck involved in protection of the trachea and sound production. The larynx houses the vocal cords, and is situated just below where the tract of the pharynx splits into the trachea and the esophagus.