A researcher propagated a small population of white mice in a laboratory by choo

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A researcher propagated a small population of white mice in a laboratory by choosing only a few mice from every s roduce offspring. The researcher observed that "fitness" of the mice decreased significantly after several generations. ollowing is the best method for increasing the survivability of the mice in the experimental population? A) Restrict the amount of food supplied to the mice. B) Increase the number of mice that are transferred from each generation. C) Introduce D)Expose the mice to a mutagen to increase their mutation rate genetic variation into the population by breeding them with a different strain of mice. 0.) Charles Il of Spain belonged to the great Hapsburg dynasty, which took over Spain in the 1500s and greatly increased power. As with many royal dynasties, the Hapsburgs tended to intermarry within their extended family, such that first co arried and it was even common for uncles to marry nieces or vice-versa. Marrying close relatives kept power within the dy d to unfortunate side effects, including a host of deformities. All these deleterious traits and effects were most likely the res A) stabilizing selection B) inbreeding depression C) heterozygote D) genetic drift advant 1.) The eastern European fire-bellied toad (Bombina bombina) and the western European fire-bellied toad (B. variegata) meet ne that is a mere 6 kilometers wide. The two species differ in certain enzymes (allozymes) and several anatomicak w a lower rate of survival than non-hybrids due to incompatible gene combinations. It has been show at least 55 genetic loci (g species. What might be inferred from the above information? ene locations) contribute to the reduction of hybrid fitness resulting from the mating of these two toad A) The hybrids form a separate species under the biological species concept Thes C) The two species are two species are likely in the process of fusin es are postzygotical isolated from each o postzygotically isolated from each other D) The two species are p 12.) Three diploid European goatsbeards plant species (Tragopogon dubius, T dbius, T. porrifolits, mirus) have been de tatter) If all three distribution in North America. Recently, two fertile tetraploid species (T miscellus porrifolius, and and T. m T pratensis) now have a broad it of allopolyploid speciation between T. dubius and T. pratensis (former) and T dubius and T porrifolius d and were the species of the original diploid plants have a chromosome count (2n) of 12, then what is the likely T. porrifolius (latter). If all three diploid chromosome count (2n) for all the new allopolyploid species? B) 3 C) 24 D) I 13.) Coyotes (Canis latrans) and eastern wolves (Canis lycaon) interbred to produce viable, fertile hybrid offspring sometimes called the "eastern coyote." The parent species shared a common ancestor very recently (about 150,000-300,000 years ago) and has a high degree of genetic similarity, although the hybrid is larger than a true coyote and smaller than a wolf and hybrid's behavior is intermediate between that of eastern wolves and coyotes. Judging from this evidence, which two species concepts are most likely to place coyotes and eastern wolves together into a single species? A) biological and morphological B) biological and phylogenetic C) and al and phylogenetic 14.) Imagine the island to flood and only the highest points of this multiple isolated populations. Which of the followin there is an island in the middle of a large river that s upports a large population of termites. Damming of the river causes A) Isolation by v island are now above water. The termites cannot swim, and so are now in best describes this event? B) Isolation by dispersal. D) Isolation by habitat differentiation. tric speciation. 2

Explanation / Answer

9) The resercher had found out that the fitness of mice had decreased after several generations . This implies that they are unable to sustain in that experimental setup. so, the best thing that can be done to increase their survivality is by introducing genetic variation into the population by breeding them with different strain of mice.By doing so desirable characteristics can be incorporated into the mice population . so option (c) will be correct.

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