28. A couple is planning to have children. The man is colorblind (xcb,y) and the woman, who is not colorblind, is a carrier for color blindness (xcb,X). What is the probability that their first child will be colorblind?
(A)25%
(B)50%
(C) 75%
(D)100%

24. Which one of the following statements is NOT true regarding the human reproductive system? (A) In the human male reproductive system, the function of seminal vesicles is to store sperms. (B) Human ovulation is triggered by surge of luteinizing hormone (LH). (C) Cilia in the oviduct convey the eggs to the uterus. (D) In human, the main sex hormones are steroid hormones.

25. Which one of the following statements is NOT true regarding the respiration system? (A) In fish gills, more than 80% of the O2 dissolved in the water is removed as water passes over the respiratory surface. (B) Respiratory surfaces are always thin and moist. (C) Fish gills use a countercurrent exchange system to increase blood flow. (D) In human lungs, cilia and mucus line the epithelium of the air ducts and move particles up to the pharynx.

26. Which one of the following statements is NOT true regarding the human endocrine system? (A) The posterior pituitary is an extension of the hypothalamus. (B) The parathyroid glands play a major role in blood Ca2+ regulation. (C) Many neurohormones regulate endocrine signalling. (D) All the hormones secreted from anterior pituitary have effects on other endocrine glands.

27. The inheritance pattern in which both alleles of a gene contribute to the phenotype of the heterozygous individual is called: (A) Dominant inheritance (B) Recessive inheritance (C) Codominant inheritance (D) X-linked inheritance

29. What is the process by which two species evolve adaptations in response to each other over time? (A) Symbiosis (B) Coevolution (C) Mutualism (D)Commensalism

30. A specimen has 35% guanine in its DNA. How much adenine does it have? (A) 15% (B)25% (C)35% (D)45%

31. Which of the following plant hormones is responsible for promoting seed dormancy and inhibiting germination? (A) Gibberellin (B)Cytokinin (C)Ethylene (D)Abscisic acid

32. What is the primary function of the pericycle in plant roots? (A) Lateral root initiation (B) Nutrient uptake (C) Water absorption (D) Mechanical support

33. Which one of the foliowing statements is NOT true regarding the human digestive system? (A) Cholecystokinin (CCK) is a hormone that induces gallbladder contraction to increase release of stored bile. (B)Secretin is produced in the duodenum and suppresses the release of gastric acid from the stomach. (C) Bile is produced by the liver, stored in the gallbladder and released intermittently into the duodenum, when needed to digest proteins. (D) Gastrin stimulants secretion of gastric acid.

34. Which one of the following statements is NOT true for the human circulation system? (A) The lymphatic system returns fluid that leaks out from the capillary beds. (B) Precapillary sphincters that control flow of blood between arterioles and venules. (C)Blood flows through only 5-10% of the body's capillaries at any given time. (D) The lymphatic system drains into capillaries in the neck.