In the study described in the Investigating Life feature, how did the researchers create the small genetic changes that led to Mimulus lewisii plants having yellow-orange flowers(instead of the pink-purple flowers found in wild-type plants) and M. cardinalis plants having dark pink flowers (instead of the red flowers found in wild-type plants)?
Selective breeding
a.Genetic drift
b.Natural selection
c. Gene flow
d. Mutation
In the study described in the Investigating Life feature, how did the researchers create the small...
QUESTION 2 Climate change is a threat to the existence of many species. Which of the following limits to natural selection hinders the adaptation of species to the new climate conditions? The developmental plans of plants and animals are too complex. They cannot cope with the warmer temperatures. Mutations happen so frequently that beneficial alleles change before natural selection can substantially increase their frequency Many species not have gene variants in their gene pool that are beneficial in higher temperatures. Climate change happens so...
2. A dominant allele H reduces the number of body bristles that Drosophila flies have, giving rise to a “hairless” phenotype. In the homozygous condition, H is lethal. An independently assorting dominant allele S has no effect on bristle number except in the presence of H, in which case a single dose of S suppresses the hairless phenotype, thus restoring the "hairy" phenotype. However, S also is lethal in the homozygous (S/S) condition. What ratio of hairy to hairless flies...