Blue poppies native to China were grown at a plant-breeding center in California. The plants with the thickest leaves were most
likely to survive and reproduce in the drier climate. After several generations, the percentage of thick-leaved plants had increased by 42%. This adaptation of the poppies to their new environment is due to _____. 1) genetic drift 2) neutral variation 3) disruptive selection 4) directional selection 5) stabilizing selection
Directional selection is a type of natural selection that favors one extreme phenotype of a genetic trait due to its survival and reproductive advantage to the individuals over another extreme phenotype and the intermediate phenotype.
In the given example, the thick-leaved plants are better adapted to a drier climate due to reduced water loss. Directional selection favored the plants with thick leaves which in turn produced more progeny. Over the generations, the population evolved into the one having more number of thick-leaved plants.
<span>Akathisia is the inability to sit still. People will tend to be uneasy and want to be doing something. They'll be fidgety, looking for something to do with their hands, or be looking to get up and walk around.</span>
Chromosomes are made up of DNA(deoxyribosenucleicacid) which is a protein complex called chromatin that is organized into subunits called nucleosomes. The way in which eukaryotes compact and arrange their chromatin also helps regulate gene expression.
Sonya has a chronic illness,
and to treat the condition, she takes an antibiotic every day. Despite her
illness, Sonya’s diet is nutritionally adequate, and she exercises regularly. Based
on this information, Sonya may need to <span>take a
dietary supplement that contains vitamin K.</span>
