selection occurs when humans select for different traits in crosses of dogs, horses, or other animals, whereas selection occurs when environmental factors act on a desirable or undesirable characteristic.

Artificial selection has resulted in a wide variety of domesticated dog breeds. Several of these breeds are shown below.Which of the following is true when a new dog breed is being developed? A. Female dogs are allowed to select male dogs with which to produce offspring. B. Humans choose the potential parents for crosses based on desired characteristics. C. Male dogs are allowed to select female dogs with which to produce offspring. D. Many dogs with varied characteristics are allowed to mate randomly.

Sexual selection is a special form of natural selection in which individuals vary in ability toMultiple choice question.coevolve with another unrelated species.obtain mates.reproduce asexually.maintain cryptic coloration.

Improved varieties of dogs, plants developed by :-Environmental selection    Natural selection     Artificial selection     Protective selection

Which of the following is natural selection?When animals or plants are bred by humans to produce desired characteristicsWhen a mutation in an organism that makes it better suited to its environment is passed on to the next generationWhen humans adapt to their environment, e.g. by wearing clothes for warmthWhen a pregnancy is terminated2What is selective breeding? When one species breeds with another speciesScreening of embryos to detect inherited disordersA process in which animals or plants are bred to produce desired characteristicsA natural process in which beneficial mutations are passed on from parent to offspring3How does selective breeding affect the gene pool of a species? It reduces variation within a speciesIt results in spontaneous mutations It increases variation within a speciesIt results in all individuals within a species having identical genotypes4What is a disadvantage of reduced variation within a species?   It is easier for a species to adapt to environmental changesIt is more difficult for a species to adapt to environmental changesIndividuals within a species will all look the sameDisease will be passed more easily between individuals within a species5Which of these is not a desired characteristic obtained through selective breeding?   Gentle nature in domestic dogsStrong, high-yield crops that mature quicklyBreathing problems in pug dogsHigh milk yield in dairy cows

Natural selection occurs whenMultiple Choicewhen a small number of individuals of a population break away and form a new population.a factor in the environment alters the genetic information in DNA of all members of a species.only when nonrandom mating occurs.a new genetic variation occurs that allows individuals to have a reproductive and survival advantage.