Which phase of the cell cycle does the cell appear to be in

Which phase of the cell cycle does the cell appear to be in

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  1. If the cell under the microscope appears to be in fourth grade it indicates that it is ready for cell divison or mitosis .

    Explanation:

    * if the cell reaches the fourth stage , it increases in size .  

    * At about the same time , the copying of the DNA happens

    this is the stage where the growth of the cell stops completely .all the concentration would be towards the division of the cell.This is the stage where the cell divides into two daughter cells .after this division , the two daughter cells also ,begin their cell cycles. so ,fourth phase of cell cycle is the beginning of the cell cycles of many daughter cells also .

  2. The best explanation if we observe an epithelial cell with chromosomes are visible and two cell nuclei is that the cell has just gone through telophase but not cytokinesis (option b).

    Explanation:

    A somatic cell, when found in mitosis, exhibits the chromosomes distributed in both poles and the outline of two nuclei in the telophase phase, just before cytokinesis.

    In mitotic telophase:

    Chromatids, which are chromosomes, are found in the cell poles. It initiates the formation of the nucleus membrane. The chromosomes begin to turn into chromatin. Disappearance of the mitotic spindle, duplication of organelles and cytoplasmic invagination.

    The division and differentiation of the nuclei in telophase is called karyokinesis. Later, cytokinesis occurs, where the daughter cells are separated.

    The other options are not correct because:

        a and d. In the other phases described, S and G1, no chromosome distribution is observed at the poles.

        c. A somatic cell does not experience meiosis.

  3. The correct answer is option b.

    Explanation:

    The p53 protein is found within the cell's nucleus and is present all over the body. Within the nucleus, the protein combines with the DNA directly. In case, when the destruction of DNA takes place within the cell by certain elements like radiation, toxic chemicals, UV exposure from sunlight, the p53 protein plays an essential role.  

    The protein helps in finding whether the DNA can be repaired or the cell needs to go through the process of apoptosis or self-destruction. The p53 protein undergoes DNA repairing by stimulating other genes, however, if the DNA fails to get the repair, it ceases the proliferation of the affected cell and signals it to go through the process of apoptosis. Thus, if a mutation in p53 takes place, the unusual cell will proliferate and eventually results in cancer.  

  4. How can an individual carry a defective gene but not exhibit the defective phenotype? An individual may not have that defective gene in every cell, and so appear normal. Also, Individuals carry two copies of gene instructions, and one dominant allele could mask the presence of a recessive defective allele

    4. 4. Mendel's law of segregation has its physical basis in which of the following phases of the cell cycle? The separation of homologous chromosome pairs in anaphase II of meiosis and the orientation of homologous chromosome pairs in metaphase II of meiosis

    5. 5. Which of the following statements about dominant traits is correct? a. The dominant trait is the one that is expressed and they are observed three-fourths as frequently as heterozygous traits. Also, they increase in frequency over evolutionary time.

    Explanation:

    5.5 Dominant traits are always expressed and they mask the recessive trait, also they exhibit either dominant homozygous form (BB) or Dominant heterozygous form (Bb). over time their frequency tends to increase as a result of their domineering effect over recessive traits

    4.4 The separation of homologous chromosome pairs in anaphase II of meiosis and the orientation of homologous chromosome pairs in metaphase II of meiosis best explains mendelian law of segregation.

    Phenotypic characteristics are always expressed by all organisms, an organism with a defective gene n ot showing it phenotypically could be best explained in this regard; An individual may not have that defective gene in every cell, and so appear normal. Furthermore, Individuals carry two copies of gene instructions, and one dominant allele could mask the presence of a recessive defective allele

  5. a) B b) D c) A

    Explanation:

    Alleles exhibit dominance over each other leading to the dominant one being express and the recessive one not expressed. Alleles are  variants (different) genes that codes for a specific trait.

    At Anaphase 1 homologous chromosomes separate leading to each being pulled to the opposite pole and the sister chromatids remain together while the homologs experience segregation.

    Dominant trait is the one that is expressed. It usually exercise dominance over recessive trait until it is removed from the recessive trait and replaced with another recessive gene before it is expressed.  

  6. ANSWER:

    Phases of Mitosis.

    STEP-BY-STEP EXPLANATION:

    The M stage includes Mitosis which is the procedure of cell division. It is made out of:  

    Prophase :

    -Nucleus breaks down  

    -Atomic layer breakdown  

    -Shaft strands show up  

    Prometaphase :

    -Shaft strands connect to chromosomes  

    -Chromosomes consolidate  

    Metaphase:  

    -Chromosomes adjust at the metaphase plate  

    -Anaphase  

    -Centromeres partition  

    -Sister chromatids move to inverse shafts  

    Telophase :

    -Atomic layer changes  

    -Chromosomes decondense  

    -Shaft filaments vanish

  7. OK OK... read below Hope this helps!

    Explanation:

    3: Prophase

    4: Chromatin

    5: Daughter cells

    6: PMAT

    7: Telophase

    8: Metaphase

    9: Anaphase

    10: Interphase

  8. It is during the G1 phase that the cell grows by producing more proteins and organelles. DNA replication occurs during the S phase. During the G2 phase, the cell prepares for cell division with the appearance of centrosomes. These three phases are collectively known as "interphase." During the M phase is when mitosis and cytokinesis occur.

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