In humans, the allele for a widow’s peak is dominant to the allele for a straight hairline. in a family with three children, two of the children have a straight hairline and one child has a widow’s peak. which of the following is possible?
a. both parents are homozygous for a straight hairline.
b. both parents are homozygous for a widow’s peak.
c. one parent is homozygous for a straight hairline, and the other is heterozygous.
d. one parent is homozygous for a widow’s peak, and the other is homozygous for a straight hairline.

protocol for imps extraction focusing on membrane protein extraction, solubilisation, and purification.

the oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. this blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. from the left ventricle, the blood passes through the aortic valve to the aorta.

deoxygenated blood leaves through the right ventricle through the pulmonary artery. from the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.