Genetics Module 6 Practice Questions and Answers for the latest Edition

In mammalian development, which of the following is the CORRECT chronological order of events? - four-cell, compacted morula, blastocyst, zygote - compacted morula, blastocyst, zygote, four-cell - zygote, four-cell, compacted morula, blastocyst - blastocyst, zygote, four-cell, compacted morula - ***- zygote, four-cell, compacted morula, blastocyst In the mitotic spindle, astral microtubules function to: - anchor the spindle poles to the plasma membrane - attach chromosomes to the spindle - carry out cytokinesis - connect the spindle poles - ***- anchor the spindle poles to the plasma membrane Which of the following is NOT true of mitotic microtubules? - Polar microtubules are required for maintaining spindle structure. - Kinetochore microtubules are responsible for pushing the spindle poles apart in anaphase B. - Kinetochore microtubules use a search-and-capture mechanism to link spindle poles to kinetochores. - Astral microtubules extend from the spindle poles to the cell cortex and orient the axis of cell division - ***- Kinetochore microtubules are responsible for pushing the spindle poles apart in anaphase B. Capture of microtubule (+) ends by chromosomes occurs during: - telophase - anaphase - prometaphase - metaphase - ***- prometaphase In the mouse embryo, pluripotent stem cells are found in the: - zona pellucida - trophectoderm - inner cell mass - blastocoel - ***- inner cell mass Poleward movement of chromosomes during anaphase A requires: - microtubule polymerization - BimC - kinetochore motor proteins - ATP - ***- kinetochore motor proteins Mitotic cyclin levels in early Xenopus embryos are regulated by: - synthesis and degradation of their mRNAs - degradation by APC - phosphorylation - degradation by MPF - ***- degradation by APC Chk1 is activated by: - Mad1 and p53 - p53 - Mad1 - ATR - ***- ATR During which stage of the cell cycle is the chromosome content of a mammalian liver cell 1n/haploid? - G1 - None of the answers is correct. - G2 - S - ***- None of the answers is correc