Question

alagy and Early Develapment Leberatory 2. Identify Homologous Chromosomes and Sister Chromatids in appropriate phases. What are homologous chromosomes? Are they present in all cells? If not, which cells lack homologous chromosomes? Are they present in all stages of mitosis? Are they present in all stages of Meiosis 1? Meiosis II? How do the terms haploid and diploid relate to the presence/absence of homologous chromosomes? What are sister chromatids? During what phase of the cell cycle do sister chromatids form? For cach phase of Meiosis, indicate if the cell is haploid (n) or diploid (2n) 3. Phase: Haploid/Diploid? Phase: Haploid/Diploid? Prophase I Metaphase I Prophase II Metaphase II Anaphase II Telophase II Anaphase I Telophase I Which of the following structures must be separated to form a haploid cell? a) Sister chromatids b) Homologous chromosomes c) Xand Y chromosomes in females d) Both a) and b). e) All of the above. 4. Using your lecture notes, and textbook figures: Focus Figure 3.4 (page 100 & 101) 27.3, and 27.4, list the major differences between Meiosis and Mitosis in the table below. MITOSIS MEIOSIS Page |12

Answer 1

Answer 2)

Homologous chromosomes are those chromosomes which are found to be similar in their homology. It means that there is found similar shaped similar arrangement of centromere in the chromosomes.

No, they are not found in the all cells. because they are not found in the haploid cell.

Yes, they are found in the whole stages of mitosis cell division.

yes they are found in the Meiosis 1 stages because meiosis 1 is a reductional division it means after meiosis 1 the haploid cells are produced which have only 1 chromosome from a homologous pair.

That's why the homologous chromosomes are not found in meiosis 2 stage of cell division.

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when the hmologous chromosomes are present, then these cells are known as diploid cell.

but when only one chromosome is present from homologous chromosome, then this is the case of haploid cells. That's why haploid cells do not have homologous chromosomes.

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sister chromatids are the identical copy of chromatid of chromosome. The sister chromatid arises by the process of duplication or replication which is found in the S phase of interphase.

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3. For each phase of Meiosis, indicate if the cell is haploid (n) or diploid (2) Phase: Haploid/Diploid? Phase: Tilapioid/Diplold? Prophase diploid haploid Prophase II Metaphase diploid Metaphase II haploid Atiphase diploid Ampliase II haploid Telophase Telephase II diploid haploid Which of the following structures must be separated to form a duploid cell? u Stratus L omologow VITOROWA c) X Y claromes in mures Botha) and e) All of the above 4. Using your lecture coles, and textbook figures, Focus Figure pige 100 & TON 27, and 27.4. list the major differences between Menosis and Mitosis in the table below. MITOSIS METOSIS same ploidy is reduced in daughter cell in daughter cellº gametes produced used in growth Page 12

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