When a male pig from a line of true-breeding (homozygous) black, solid-hooved pigs was crossed to a female from
a breed (homozygous of red, cloven-hooved pigs, their several progeny all looked alike with regard to color and
hooves. these progeny were all mated to members of the same breed as their red, cloven-hooved mother pig. the
offspring from this final cross were: 11 black, cloven-hooved: 8 black solid-hooved: 14 red, clover hoved; and 10
red. solid-hooved. for each of these two genes (coat color and hoof type) determine which allele is the dominant
one. explain your reasoning. what were the phenotypes of the progeny produced by the first mating in this
problem?

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

What is a gene ? a) a section of a protein that codes for dna. b) the alternate version of a trait. c) the visible trait in the f1 generation. d) a section of dna that codes for a specific trait .

Adrought killed all the plants in an agricultural farmland. gradually, due to wind and some birds for. nearby areas, new plants started sprouting l. what stage of succession was taking place in the farmland? a) competition b) nudation c) ecesis d) reaction e) migration