Answer Q12 ssici axonomic system invented by Linnaeus, modern systematies lenes

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Answer Q12 ssici axonomic system invented by Linnaeus, modern systematies lenes the assumption that major kingdoms arose during the Cambrian. b. species that occupy similar habitats have similar traits c. any given genus must have at least two species. d. rates of anagenesis are-constant across most taxa. species are related by evolution. hylogenetic analysis is based on the assumption that closely-related species will have more than distantly-related ones a. similar ecological niches b. similar genetic codes c. overlap in their geographical ranges d. shared derived characteristics e. Archaean endosymbionts n some cases, interspecies hybrids that are viable but sterile (for example, those that result from crosses between the Galeopsis species G. speciosa and G. pubescens) can give rise to a new, fertile species (e.g., the common hemp nettle, G. tetrahit) when a. the X chromosome and the Y chromosome fuse into a single new chromosome (which changes the hybrid into a hermaphroditic species) b. the total number of chromosomes doubles via the process of "complete non-disjunction" (which converts the hybrid from an allodiploid into an allotetraploid) c. continental drift mechanically isolates the hybrid from the two parental species. d. the genes that control fertility evolve via genetic drift. e. the hybrids are transferred to a more suitable environment. 13. Asexual species, extinct species, and "ring" species all present problems for the a. anti-anagenesis algorithm b biological species concept d. theory of evolution by natural selection e. endosymbiont hypothesis c. competitive exclusion principle 14. Eukaryotes have existed on this planet for approximately 15. Among the following, which was the last (i.e., most recent) to evolve? 16. Among the following conditions, years. e.40 billion b. 400 million c.2 billion d. 5 billion a. 1 million b. trilobites c. cyanobacteria d. reptiles e. seed ferns a. flowering plants at least some are necessary in order for a trait to evolve by natural selection. Which of these is NOT also required for a trait to evolve via genetic drift? the trait must vary within a population b. the trait must affect fitness s the troi

Explanation / Answer

12) Individuals of two different species reproduce to form viable offspring is attained by a form of polyploidy termed as allopolyploid. An allopolyploid occurs when gametes from two different (but closely related species) species combine.  Polyploidy arises as the result of total nondisjunction of chromosomes.

Allodiploid: It has1 set of chromosomes from 2 different species, Therefore it has higher chances of aneuploidy and hence sterile hybrid.

Allotetraploid - 2 sets of chromosomes from each of the 2 species (36 chromosomes than the regular 18 for a diploid). During anaphase of meiosis I, pairs of chromosomes can synapse and produce cells with 18 chromosomes that can then combine to produce an allotetraploid with 36 chromosomes: FERTILE organism

So the correct option is B. The total number of chromosomes doubles via the process of 'complete non-disjunction'

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