The following questions refer to the essential steps inmeiosis described below.

1. formation of 2 newnuclei, each with n numberchromosomespresent

2. alignment ofdyadsat the metaphase plate

3. separationof sisterchromatids

4. separationof thehomologs; no uncoupling of centromeres

5. synapsis; tetrad“chromosomes” moving to the middle of the cell in pairs

49.__  From the descriptions above, which of thefollowing is the orderthat most logicallyillustrates a sequence of meiosis?

A) 5, 4, 2, 3, 1      B) 5, 4, 1,2, 3         C) 5, 3,2, 4,1           D)4, 5, 2, 1, 3    E) 5, 2, 4, 3, 1

50.__ Which of the steps take place in onlymeiosisandnot in mitosis?

A) 1,2, and 3

B) 1,2,4, and 5

C) 1,4, and 5

D) 2 and 3 only

E) 2,3, and 5

55.__ During which portions of the cell cycle are “chromosomes”composed of two chromatids (dyads)?

A) during interphase throughanaphase

B) during G₁of interphasethrough metaphase

C) during metaphase throughtelophase

D) during anaphase throughtelophase

E) during G₂of interphasethrough metaphase

56.___ Which of these statements is false?

A) In humans, each of the 22 maternalautosomes has a homologous paternal chromosome.

B) In humans, the 23rd pair, the sexchromosomes, determines whether the person is female (XX) or male(XY).

C) Single, haploid (n) setsof chromosomes in ovum and sperm unite during fertilization,forming a diploid (2n), single-celled zygote.

D) At sexual maturity, ovaries andtestes produce diploid gametes by meiosis.

E) Sexual life cycles differ withrespect to the relative timing of meiosis and fertilization.

59.__ All of the following are functions of meiosis in protists(algae) except:

A) reduction of chromosome number by half.

B) independent assortment of chromosomes.

C) production of spore cells.

D) production of gamete cells.

E) crossing over and recombination of homologouschromosomes.

60.___ How do the 4 daughter cells at the completion of meiosiscompare with cells that have replicated DNA and are just about tobegin G₂ of interphase?

A) They have twice the amount of cytoplasm and half the amountof DNA.

B) They have half the number of chromosomes and half the amountof DNA.

C) They have the same number of chromosomes and half the amountof DNA.

D) They have half the number of chromosomes and one-fourth theamount of DNA.

E) They have half the amount of cytoplasm and twice the amountof DNA.