In drosophila, an autosomal gene determines the shape of the hair, with b giving straight and b giving bent hairs. on another autosome, there is a gene of which a dominant allele i inhibits hair formation so that the fly is hairless (i has no known phenotypic effect). a. if a straight-haired fly from a pure line is crossed with a fly from a pure-breeding hairless line known to be an inhibited bent genotype, what will the genotypes and phenotypes of the
f1
and the
f2
be? b. what cross would give the ratio 4 hairless : 3 straight : 1 bent?

Wetlands form where water and land meet. a lake with a wetland fringe can fill in with decayed plant and animal material to become a wet meadow. a pond can fill in to become a bog or fen. sediment can fill in a river marsh to become a swamp.flooding of coastal lowlands from rising sea levels has created broad coastal marshes that are protected from wave action by barrier islands or reefs. coastal wetlands also form when rivers deposit sediment as they reach the ocean. plants then take root and hold the soil firm against the forces of tides and waves.