The kinked (ki) and the striped (sr) genes of Drosophila are linked. Both are located on chromosome 3 at map positions 47.6 and 62, respectively. The recessive all (ki) of the kinked gene causes kinked bristles instead of straight. The recessive allele (sr) of the striped gene causes stripes on the back of the thorax that are not present in wild type flies. Homozygous male fruit flies with "kinked" bristles and normal thorax are mated to homozygous females with normal bristles and "striped" thorax.

a.) Draw out the cross described above. Illustrate the pair of 2nd chromosomes, including the kinked and striped alleles, of the male and of female flies.
b.) Draw the chromosomes and alleles for the F1 offspring of the cross in part a. c.) If the F1 hybrid female fruit flies are mated to tester males with kinked bristles and striped thorax, what phenotypes are expected in the F2 generation? Predict % of each of the different phenotypes.

Read the following scenario to answer the following question. 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. when most populations of a wide-ranging amphibian species are lost and the few remaining populations are widely separated, we expect to see that a. the founder effect becomes increasingly important b. microevolution no longer occurs c. gene flow between populations is reduced d. artificial selection becomes a greater factor in microevolution

Which of the following does not make up ground substance of connective tissue? hyaluronic acid elastic fibers glycosaminoglycan proteoglycan

How do the sperm cells get from the stigma to the ovules?