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When do chromosomes become visible in the nucleus of a cell?
Chromosomes become visible in the nucleus of a cell during cell division, specifically during the prophase stage of mitosis or meiosis when the DNA condenses and coils tightly. This allows the chromosomes to be distinguished under a microscope.
What happens during prophase you that does not happen during mitosis?
During prophase in meiosis, homologous chromosomes pair up and undergo crossing over, exchanging genetic material. This process does not occur during mitosis, where individual chromosomes line up and separate without crossing over.
What happens to the nuclear membrane during prophase?
Resulting from interphase, is a genetic material in the nucleus called chromatin. The chromatin condenses in chromosomes. During prophase, the nucleoli disappear and the chromatid structure of the chromosomes becomes apparent. Since each chromosome has duplicated and now consists of two sister chromatids, the nuclear membrane dissolves so that the sister chromatids can separate. If it didn't dissolve, they'd still be held together.
What is the pairing of homologous chromosomes called?
The pairing of homologous chromosomes is called synapsis. It occurs during prophase I of meiosis when homologous chromosomes come together and exchange genetic material through a process called crossing over.
What stage in mitosis does the chromosomes uncoil happen?
During the telophase phase, the chromosomes begin to uncoil. There are six phases with mitosis and telophase is number four.
Are chromosomes visible during pro-phase?
yes they are now visible during prophase
When do chromosomes become visible in the nucleus of a cell?
Chromosomes become visible in the nucleus of a cell during cell division, specifically during the prophase stage of mitosis or meiosis when the DNA condenses and coils tightly. This allows the chromosomes to be distinguished under a microscope.
What happens during prophase you that does not happen during mitosis?
During prophase in meiosis, homologous chromosomes pair up and undergo crossing over, exchanging genetic material. This process does not occur during mitosis, where individual chromosomes line up and separate without crossing over.
What happens to the nuclear membrane during prophase?
Resulting from interphase, is a genetic material in the nucleus called chromatin. The chromatin condenses in chromosomes. During prophase, the nucleoli disappear and the chromatid structure of the chromosomes becomes apparent. Since each chromosome has duplicated and now consists of two sister chromatids, the nuclear membrane dissolves so that the sister chromatids can separate. If it didn't dissolve, they'd still be held together.
What is the pairing of homologous chromosomes called?
The pairing of homologous chromosomes is called synapsis. It occurs during prophase I of meiosis when homologous chromosomes come together and exchange genetic material through a process called crossing over.
What stage in mitosis does the chromosomes uncoil happen?
During the telophase phase, the chromosomes begin to uncoil. There are six phases with mitosis and telophase is number four.
Name 2 things that occur during telophase 1?
The nuclear membrane and nucleolus (these had disappeared during prophase). They had originally disappeared during prophase because the chromatin condensed into chromatids and then coiled into chromosomes and needed to seperate. They reappear during telophase because the chromatid uncoils again to form chromatin. This means that the cell no longer needs to seperate so it can reform the membrane and nucleolus.
What stage do the chromosomes condense and thicken and are now see in separate distinct structures?
Chromosomes condense and thicken during the prophase stage of mitosis (or meiosis). In this phase, the chromatin fibers become tightly coiled and coiled, making the individual chromosomes visible as distinct structures under a microscope. Each chromosome consists of two sister chromatids joined at the centromere, preparing for segregation in the subsequent stages of cell division.
What has occurred at the end of Prophase?
At the end of prophase all of the chromosomes(chromatids joined at the centromere) are now floating around the cells and the spindle fibers are formed. Then you go into Metaphase where the chromosomes line up in the center of the call and the centromeres attach to the spindle fibers. Hope that helped!:)
When does the nuclear envelope form?
The nuclear envelope is the nuclear membrane.
What happens during the four phases of mitosis?
During prophase, the chromosomes condense and become visible, the nuclear envelope breaks down. During metaphase, the chromosomes line up along the center of the cell. During anaphase, the sister chromatids separate and move towards opposite poles. Finally, during telophase, the chromosomes decondense, the nuclear envelope reforms, and the cell divides into two daughter cells during cytokinesis.
What subphase of mitosis is it when an array of microtubles called spindle fibers now extend between the two centrioles?
This subphase is known as prometaphase in mitosis. During prometaphase, the nuclear envelope breaks down, allowing the spindle fibers to interact with the condensed chromosomes. This is a critical stage for the proper alignment and separation of chromosomes during cell division.
