Fill in the blanks beside the following descriptions of the events in a human sp

Question

Fill in the blanks beside the following descriptions of the events in a human spermatocyte with one or more of the phases listed below, writing the letter - phase list in the lied pages. Stages/Phases: anaphase II, prophase I, cytokinesis I, metaphase II, anaphase I, metaphase I, G1 a. partial formation of nuclear envelope _____ b. alignment of paired homologues _____ c. 23 bivalents are present _____ d. separation of centromeres _____ e. cell growth _____ f. equational division _____ g. 92 chromosomes are present _____ h. disintegration of nuclear membrane _____ i. 92 sister chromatids are present _____ j. alignment of chromatid pairs _____

Explanation / Answer

a) cytokinesis I

b) metaphase I

c) prophase I, metaphase I, anaphase I

d) anaphase II

e) G1

f) anaphase I

g) anaphase (of mitosis) - when sister chromatids separate from each other they are now considered as separate chromosomes. So, 2x46 = 92

h) prophase I

i) prophase I, metaphase I, anaphase I (after s-phase number of chromatids = 2xnumber of chromosomes because duplication/replication occurs)

j) metaphase II

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