5. The first meiotic division achieves which of the following? A: separation of

Question

5. The first meiotic division achieves which of the following? A: separation of gametes B: separation of homologous chromosomes C: formation of two daughter cells D: separation of sister chromatids E: B and C are correct 6. Factors critical in controlling development that are secreted into the immediate spaces around the cells producing them are called: A: juxtacrine factors B: paracrine factors C: endocrine factors D: both A and B are correct E: none of the above 7. If 10 diploid human spermatogonia undergo complete and normal gametogenesis,_ number of chromosomes. number of daughter cells are formed each with A: 1, 23 B: 10, 23 C: 1,46 D: 40, 23 E: 10, 46 8. Structures that are structurally similar due to common ancestry are said to bewhile structures that are similar due to the need to perform similar function are said to be A: analogous, homologous B: homologous, analogous C: non-analogous, non-homologous D: non-homologous, non-analogous E: all of the above 9. Creation of cellular diversity during development is more appropriately associated with which of the following processes? A: morphogenesis B: organogenesis C: induction D: differentiation E: morphogenesis 10. Double fertilization in flowering plants results in formation of a diploid structure (2n) and a triploid structure (3n) known respectively as: A: zygote and embryo B: zygote and endoderm C: zygote and blastula D: zygote and endosperm

Explanation / Answer

5. Option E is correct.

First meiotic division separates two sets of homologous chromosomes and produces two daughter cells (Sometimes these two daughter cells are not separated)

6. Option D is correct.

Juxtacrine factors require cell-cell attachment. Paracrine factors work in the vicinity of the secreted cell.

7. Option D is correct.

A single meiotic division produces 4 haploid cells.

10 diploid human cell would produce 40 haploid cells each with 23 chromosomes.

8. Option A is correct.

Homologous organs = Common origin but different function

Analogous organs = Different origin but common function.

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