If the male labelled X is later mated to a black female, what ratio of coat colour would be expected in the offspring?

Correct Answer: D

Rationale: The male labeled X must carry both brown and black coat color genes as it is brown. When mated with a black female, the male will pass on either a brown or black gene to the offspring. This results in a 1:1 ratio of brown to black coat color in the offspring. All black (A) and all brown (B) are incorrect as the male carries both genes. The 3:1 ratio (C) is not applicable here as the male can pass on either brown or black gene equally.

Correct Answer: A

Rationale: The correct answer is A (80s) because the half-life of an isotope is the time taken for half of the radioactive nuclei to decay. In this case, it takes 80 seconds for half of the nuclei to decay. The other choices (B, C, D) are incorrect as they do not represent the correct time interval required for half of the nuclei to decay.

Correct Answer: B

Rationale: The correct answer is B: hypothalamus. The hypothalamus is considered a neuroendocrine organ because it produces and releases hormones that regulate the pituitary gland's hormonal secretion. It acts as a bridge between the nervous system and the endocrine system, controlling various physiological processes. The pituitary gland (choice A) is a master endocrine gland, not a neuroendocrine organ. The pancreas (choice C) is an exocrine and endocrine gland involved in blood sugar regulation. The adrenal cortex (choice D) is part of the adrenal glands responsible for producing steroid hormones, not considered a neuroendocrine organ.

Correct Answer: A

Rationale: The correct answer is A: adipose tissue. Resistin is primarily produced by adipose tissue and is known to antagonize the action of insulin, leading to insulin resistance. Adipose tissue is a major source of various hormones, including resistin. Option B: heart, and Option C: liver, are not the correct answers because resistin is not known to be produced by these organs. Option D: hypothalamus, is also not the correct answer as resistin is not produced by the hypothalamus. In summary, the correct answer is A because resistin is primarily produced by adipose tissue, which plays a significant role in insulin resistance.

Correct Answer: B

Rationale: The correct answer is B: Renal artery. The inferior suprarenal artery arises from the renal artery, which supplies blood to the adrenal gland. This is anatomically accurate as the adrenal gland is located superior to the kidneys. The other choices (A: Abdominal aorta, C: Inferior phrenic artery, D: Splenic artery) do not supply blood directly to the adrenal gland. The abdominal aorta gives rise to the renal artery, the inferior phrenic artery supplies blood to the diaphragm, and the splenic artery provides blood to the spleen. Therefore, they are not the correct origin of the inferior suprarenal artery.