A dog with the genotype ‘Aa’ would be

Heterozygous, and would express the dominant trait.

Explanation:

If the dog has one allele for each trait (A and a) it would be considered heterozygous because it has two different alleles for that particular gene, and since A is dominant over a (indicated by the capital A) the dog will express whichever trait is linked to the A allele.

a. possible errors

d. new questions

explanation:

predictions and planning happen before. a summery comes after. errors you get after investigation and new questions propose what you can look for in the future.

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.