By Allan B. Cobb
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Extra resources for Animal Sciences. A-Crep
Male bee-eaters will typically forgo reproducing when they are young, instead opting to help more mature birds raise their young. These young males help relatives more often than nonrelatives, thus raising their inclusive fitness. Young males that attempt to have their own offspring actually fare worse than helpers because their territories are too poor to raise more than one chick. Conclusion The classic example of altruism occurs in the eusocial bees. Honeybee workers rarely reproduce, letting the queen provide all the offspring.
Roberts, and Allan Larson. Animal Diversity. Dubuque, IA: Wm. C. Brown, 1994. Hildebrand, Milton. Analysis of Vertebrate Structure. New York: John Wiley, 1994. Allometry The relationship of the growth of one part of an organism to the growth of another part or the growth of the whole organism is called allometry. The term also applies to the measure and study of such growth relationships. ” Isometric growth, where the various parts of an organism grow in one-to-one proportion, is rare in living organisms.
Antibodies are divided into five different classes. IgA antibodies function at mucous-producing surfaces such as the bronchioles, nasal passages, vagina, and intestine. They are also present in saliva, tears, and breast milk. 33 Antibody Antigen binding site Antigen binding site Light chains Antigen binding site Antigen binding site Light chain Disulfide bonds Heavy chain Heavy chains Antibodies are made by immune system cells known as B-lymphocytes. Redrawn from Hans and Cassady. placenta the structure through which a fetus obtains nutrients and oxygen from its mother while in the uterus The function of antibodies of the IgD group is unclear.
Animal Sciences. A-Crep by Allan B. Cobb