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Biology Mini Test: Ch 9 / 14Multiple Choice:

Question 1

Question 2

Question 3

The following information is relevant to questions 4 and 5

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Question 4

Question 5

Question 6

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Question 7

Question 8

Question 9

Question 10

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Short Answer:

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Answers:

Multiple Choice:1. TN 1- Q 5ANS: CThe genome includes all the DNA that may be found in a speies.

2. TN 1- Q 6ANS: DThe set of instructions is being considered here. A gene is the only option that fits this analogy.

3. TN 2- Q 2ANS: AA chromosome consists of DNA and protein.

4. TN 2- Q 5ANS: BS refers to the synthesis stage. Many cell components are replicated and DNA replication occurs.

5. TN 2- Q 6ANS: CChromosomes are not visible prior to mitosis. In the early part of mitosis they are visible as paired chromatids. Later in mitosis, at anaphase, they separate into single chromatids.

6. TN 2- Q 7ANS: DThe two copies of chromosome 17 have come from two parents, paternal and maternal. They will contain the same genes but not necessarily the same alleles. Regions between genes can also vary from one individual to another. There are 44 autosomes and the karyotype is from a male, XY.

7. TN 2- Q 8ANS: CIf 2n = 38, then n = 19. A gamete is haploid and has n chromosomes.

8. TN 2- Q 14ANS: AHomologous chromosomes have the same gene at the same position on the chromosome.

9. TN 4- Q 3ANS: BChromatids separate at anaphase II. Homologous pairs separate at anaphase I.

10. TN 4- Q 8ANS: CThe cross Ss x ss gives 50% Ss and 50% ss.

Short Answer: TN 2- Q 11. a) i. Meiosis

ii. F A E B D C

b) During meiosis the number of chromosomes in daughter cells is reduced. Each daughter cell receives one member of each homologous pair, thus halving the chromosome number.

c) Two chromatids which belong to different members of the homologous pair exchange genetic material (DNA). This results in new combinations of alleles along the length of the two chromatids.

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