In humans, the correlation between recombination frequency and length of dna sequence is, on average, 1 million bp per 1% re during the process of mapping the huntington disease gene (hd), it was found that hd was linked to a dna marker called g8with an rf of 596. surprisingly, when the hd gene was finally identified, its physical distance from g8was found to be about 500,000 bp, instead of the expected 5 million bp. how can this observation be explained?

Over the past 60 years, many amphibian species have experienced significant population declines and some species have become extinct. scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. however, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. these global declines suggest widespread problems including increased ultraviolet radiation, acid rain, and disease. in switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction. chytridiomycosis is a fungal disease first identified in 1998 as a cause of massive amphibian deaths. in some severely impacted populations, a few individuals have survived, perhaps because of some natural resistance. if these resistant individuals continue to survive and prosper, new resistant populations might emerge. this would be an example of the founder effect artificial selection genetic drift natural selection sexual selection

Which of the following is not a food produced in rainforests? a) coffee b) cocoa c) avocados d) wheat

Which is an example of a vestigial structure? a. tail of a monkey b. fin of a fish c. flower of a plant d. tailbone of a human