TEST BANK FOR HUMAN GENETICS AND SOCIETY, 2ND EDITION BY YASHON

Chapter 1 – Sex and Development Chapter 1—Sex and Development MULTIPLE CHOICE 1. What is the normal number of chromosomes for a human? a. 44 b. 42 c. 40 d. 46 e. 45 ANS: D PTS: 1 DIF: Easy REF: p. 14 2. Which of the following properties does a zygote possess? a. Carries XX, XY, or YY chromosomes. b. Cell division occurs before fertilization. c. Carries 1 pair of sex chromosomes and 22 pairs of autosomal chromosomes. d. Carries an X or Y chromosome and a single set of 22 autosomal chromosomes. e. Undergoes multiple meiotic cell divisions to produce an embryo. ANS: C PTS: 1 DIF: Easy REF: p. 14 3. Which of the following statements is true about sex ratios? a. Based on production of sperm, we would expect the sex ratio to be 2 males for every 1 female. b. More females than males are conceived. c. By 20 years of age, the ratio of males to females is 1:1. d. About the same number of males and females are born. e. By 60 years of age, there are more males than females. ANS: C PTS: 1 DIF: Moderate REF: p. 14 4. Whether a fetus develops as a male or female depends on a. a complex interaction of genes and environment. b. hormones produced by the mother during pregnancy. c. how many sperm enter the egg. d. the number of autosomes present. e. only on which sex chromosomes are present. ANS: A PTS: 1 DIF: Easy REF: p. 21 5. What is the normal number of pairs of chromosomes for humans? a. 21 b. 22 c. 23 d. 24 e. 42 ANS: C PTS: 1 DIF: Easy REF: p. 14