Concept explainers
To explain: The conditions in sexual selection that favor polygynous (or polyandrous) mating systems.
Introduction: The selection of the species is chosen by nature itself. Criteria of adaptability and having the superior genes that are beneficial for the population in an individual are promoted by the natural selection. The variations that are adopted by the individual serve the criteria for a better survival rate of the species.
To explain: The reason why monogamy is uncommon.
Introduction: The selection of the species is chosen by nature itself. Criteria of adaptability and having the superior genes that are beneficial for the population in an individual are promoted by the natural selection. The variations that are adopted by the individual serve the criteria for a better survival rate of the species.
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- Would you expect environmental conditions to influence syngamy? Design two experiments to investigate the effects of two environmental conditions on the frequency of syngamy. How would you measure syngamy? Its frequency?arrow_forwardThe genetic identity of the female parent is RrGg and the genetic identity of the male parent is Rrgg. They produce 320 offspring together from a single mating: 57 red-eyed females with grey bodies, 61 red-eyed females with yellow bodies, 22 brown-eyed females with grey bodies, 20 brown-eyed females with yellow bodies.59 red-eyed males with grey bodies, 63 red-eyed males with yellow bodies, 20 brown-eyedmales with grey bodies, 18 brown-eyed males with yellow bodies. Show the simultaneous transmission of the two genes involved to give rise to the progeny given with the use of genetic diagrams and summaries as required. (Hint: you are only requiredto show the simultaneous transmission from the P to F1 generations)arrow_forward|(A) A well trained alien biologist visiting earth would be able to tell that the mating system of gorillas is strongly polygynous and that of man's weakly polygynous. How could he/she/it tell this just by looking at gorillas and humans? (B) Is harem polygyny an ESS or have "cheater" behaviors evolved to exploit or exist within these systems? (C) If your answer was yes then describe a cheater behavior within a polygynous system.arrow_forward
- In fruit flies and humans, sex is determined by an X-Y system. However, many organisms do not have the X-Y system of sex determination just like in birds. Instead, they have the Z-W system. Male birds are ZZ whereas, female birds are ZW. In chickens, barred feathers (ZB) are dominant over nonbarred feathers (Zb). If a barred female chicken mates a nonbarred male chicken, what is the probability of having barred female offspring? 50% 0% 25% 100%arrow_forwardPhalaropes are shore birds with brightly colored females and dull colored males. Females are larger than males and compete with each other for access to males. Considering sexual selection theory, select the idea(s) below that seem(s) most plausible in light of the pattern of sexual dimorphism? Pick all that apply This is a picture of a brightly colored female: O Females incubate eggs and care for the young. Males incubate eggs and care for the young Males are choosy. males are not choosyarrow_forwardWould you expect sexual selection to increase or decrease adaptation of a population to its environment? Do the pleiotropic effects and good genes mechanism for the evolution of female preferences differ in their implications for adaptation to the environment?arrow_forward
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