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.
Want to see the full answer?
Check out a sample textbook solutionChapter 52 Solutions
Biology (MindTap Course List)
- Why are polyandrous mating systems more rare than polygynous matings? Only males are capable of multiple rounds of reproduction within a single breeding season Only females care for the young Females usually experience more intrasexual selection pressure than males Females usually devote more energy to offspring production and development.arrow_forwardWhat determines whether a gamete is male or female? Explain why this difference predicts the two main forms of sexual selection.arrow_forwardBy what three mechanisms does sexual reproduction increase genetic variability? How does this increase in genetic variability affect the evolution ofspecies?arrow_forward
- My college Bio teacher asked me this question in response to one of my photos I posted on Facebook: "I wonder why some birds exhibit sexual dimorphism while others do not." Can someone explain this phenomenom in detail?arrow_forwardWhat prevents an individual from mating with itself?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
- In some species, sex is determined by environmental, rather than genetic, factors. This is true of: kangaroos humans turtles birds beesarrow_forwardDescribe what sexual dimorphism is and why its existence is puzzling.arrow_forwardIn some animal species, being tall is dominant over being short. If a homozygous dominant individual mates with a short individual, what is the chance that their offspring will be heterozygous?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_forwardWhy does sexual dimorphism have important implications for studying human evolution? Explain why and prove it with examples.arrow_forwardSex determination is primarily governed by either the male heterogamety of XX/XY type or female heterogamety of ZW/ZZ type with a seemingly one-to-one sex ratio of males to females. Many breeders of mammals would prefer a bias though towards a greater proportion of females to males due to males being overall less productive to females. What benefit is there is having a relatively equal proportion of male to female offspring when, in production terms, this is less then desirable?arrow_forward
- Biology (MindTap Course List)BiologyISBN:9781337392938Author:Eldra Solomon, Charles Martin, Diana W. Martin, Linda R. BergPublisher:Cengage LearningBiology 2eBiologyISBN:9781947172517Author:Matthew Douglas, Jung Choi, Mary Ann ClarkPublisher:OpenStaxHuman Heredity: Principles and Issues (MindTap Co...BiologyISBN:9781305251052Author:Michael CummingsPublisher:Cengage Learning