Question

6 True/False: Mark the following statements as true (T) or false (F). If the statement is false, correct it to make it a true statement. a. Gametes result from two rounds of cell division. b. Meiosis results in diploid cells. C. Homologous chromosomes overlap at points called chiasmata or crossover. d. The DNA replicates prior to the start of meiosis II. 7 Number the following events of spermatogenesis in the proper order, with number 1 next to the first event and number 5 next to the final event. Primary spermatocytes undergo meiosis I to yield two secondary spermatocytes. Spermatids migrate to the epididymis to undergo spermiogenesis. The two secondary spermatocytes undergo meiosis Il to produce four haploid spermatids. Spermatogonia divide into more spermatogonia and primary spermatocytes. Spermatogonia undergo repeated rounds of mitosis. Reproductive System . UNIT 2

Answer 1

6.a true - gametogenesis includes two cell division- mitosis is fowllowed by meisis I and then meiosis II.

b.false - meiosis is reductional division which is occur only in diploid cell and results in haploid cell.

  c.true - self explanatory

d. false - DNA replication takes place before Meiosis I begins in S phase of interphase.

7. 1.spermatogonia undergo repeat round of mitosis.

2.spermatogonia divide into more spermatogonia and primary spermatocyte

3.primary spermatocytes undergoes meiosis I to produce two secondary spermatocytes.

4.two spermatocytes undergoes meiosis II to produce four haploid spermatids.

5.spermatids migrate to epididymis to undergo spermiogenesis.

8.First mitotic division is same in both spermatogenesis and oogenesis but the in next stage equal meotic division is occur in spermatogenesis whereas in oogenesis unequal meiotic division occur to produce -

in meiosis I - primary oocyte and a polar body (does not divide)

in meiosis II - ootid and secondary polar body (does not divide)

so only one ootid differentiate to for one ovum

But in spermatogenesis equal division form

in meiosis I - Two secondary spermatocyte

in meiosis II - Four spermatid(which then differentiate to form four sper) produce form two secondary spermatocyte .

9.c.Corpus luteum

The endocrine organ that forms from the ruptured vesicular follicle is called the corpus luteum.