4. In humans, what is the ter that they have two of the same sex chromosomes? He
ID: 198910 • Letter: 4
Question
4. In humans, what is the ter that they have two of the same sex chromosomes? Heteroga 5. Which phase of the cel cycte is DNA replicated? m that we could apply to females to describe the fact meic s and ehesscnsse duplicohsi 6. Most cells do not go directly from DNA replication to mitosis- what needs to happen first and what is the name of this phase of the cell cycle? 7. What are the names and orders of the 5 subdivisions of mitosis? Prophase, Prometaphase, Metaprasenapa telophose Prometaphase, Mera 8. What does the cell check to make sure has happened at the checkpoint after DNA replication, but before mitosis? 9. What does the cell check to make sure has happened at the checkpoint before entering DNA replication? 10. What does the cell check to make sure has happened at the checkpoint during metaphase?Explanation / Answer
4.
Homogametic Females: when females carry the same 2 sex chromosomes
5.
DNA replication occurs during the S phase of cell cycle.
6.
Cells donot enter the mitosis phase immediately after the DNA replication. Cells need to prepare themselves for the mitosis to occur. This period between DNA replication and mitosis is known as G2 phase. This is the period during which protein synthesis and rapid cell growth ocuur in order to prepare the cell for mitosis. During this phase microtubules begin to reorganize to form a spindle.
7. Five subdivisions of mitosis :-
8.
the checkpoint after DNA replication but before entering the mitosis phase is known as G2/M checkpoint. This chechpoint checks for any DNA damage and also ensures that DNA replication has completed before the cell ener the Mitosis phase. This checkpoint ensures that cells don't initiate mitosis before they have a chance to repair damaged DNA after replication.
9.
The checkpoint before enetring the DNA replication (S Phase) is known as G1 checkpoint or restriction checkpoint, which is the main decision point for a cell . The primary G1/S cell cycle checkpoint controls the commitment of eukaryotic cells to transition through the G1 phase to enter into the DNA synthesis S phase. G1/S Checkpoint cheks the existence of all conditions (cell size, nutrients and enzymes) required for DNA synthesis and also checks for DNA damage.
10.
The checkpoint during mitosis is known as the M Checkpoint or Spindle checkpoint. During this checkpoint, the cell examines whether all the sister chromatids are correctly attached to the spindle microtubules and alligned properly at the metaphase plate. As the separation of the sister chromatids during anaphase is an irreversible step, the cell cycle will not proceed until all the chromosomes are firmly attached to at least two spindle fibers from opposite poles of the cell.
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