17. If there are 20 chromatids in a cell at metaphase, how many chromosomes are there in each daughter cell following cytokinesis?
(A) 10
(B) 20
(C) 30
(D) 40

18. Which of the following occurs in meiosis but not in mitosis? (A) Chromosome replication (B) Synapsis of chromosomes (C) Production of daughter cells (D) Alignment of chromosomes at the equator

19. Homologous chromosomes synapse and crossing over occurs (A) The statement is true for mitosis only (B) The statement is true for meiosis I only (C) The statement is true for meiosis II only (D) The statement is true for mitosis and meiosis I

20. Which of the following happens at the conclusion of meiosis I? (A) Homologous chromosomes are separated (B) The chromosome number per cell is conserved (C) Sister chromatids are separated (D) Four daughter cells are formed

21. In certain plants, tall is dominant to short. If a heterozygous plant is crossed with a homozygous tall plant, what is the probability that the offspring will be short? (A) 1 (B) 1/2 (C) 1/4 (D) 1/6

22. In a cross AaBbCc × AaBbCc, what is the probability of producing the genotype AABBCC? (A) 1/8 (B) 1/16 (C) 1/32 (D) 1/64

23. Mendel was able to draw his ideas of segregation and independent assortment because of the influence of which of the following? (A) The understanding of particulate inheritance he learned from renowned scientists of his time (B) His discussions of heredity with his colleagues at major universities (C) His reading of the scientific literature current in the field (D) His experiments with the breeding of plants such as peas

24. Skin color in a certain species of fish is inherited via a single gene with four different alleles. How many different types of gametes would be possible in this system? (A) 1 (B) 2 (C) 4 (D) 8

25. Calico cats are female because (A) a male inherits only one of the two X-linked genes controlling hair color (B) the males die during embryonic development (C) the Y chromosome has a gene blocking orange coloration (D) only females can have Barr bodies

26. If a human interphase nucleus contains three Barr bodies, it can be assumed that the person (A) has hemophilia (B) is a male (C) has four X chromosomes (D) has Turner syndrome

27. A cell that has 2n + 1 chromosomes is (A) trisomic (B) monosomic (C) euploid (D) polyploid

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