#### • Class 11 Physics Demo

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# how many chromosomes does each daughter cell have

Question:If a parent cell starts with 4 chromosomes, how many chromosomes will each daughter cell have after mitosis is done?

Answers:IN MITOSIS (ASEXUAL REPRODUCTION) EACH CHROMOSOME MAKES A COPY OF ITSELF DURING INTERPHASE. AT THE MITOTIC STAGE METAPHASE THE DUPLICATED CHROMOSOMES ARE LINED UP ON THE EQUATORIAL PLATE OF THE CELL. THE NEXT STAGE ANAPHASE THE DUPLICATED CHROMOSOMES SPLIT AT THE CENTROMERE THAT WAS HOLDING THEM TOGETHER. THE CHROMOSOMES GO TO THE POLES OF THE CELL (TELOPHASE) AND FINALLY CYTOKENESIS (THE SPLITTING OF THE CELL MEMBRANE) YIELDS TWO DAUGHTER CELLS. EACH OF THE DAUGHTER CELLS HAS THE EXACT SAME NUMBER OF CHROSOMES AS THE PARENT CELL FOR EXAMPLE EACH SKIN CELL THAT UNDERGOES MITOSIS WILL PRODUCE SKIN CELLS THAT ARE EXACTLY LIKE THE PARENT CELL

Question:Fruit flies have eight chromosomes in their somatic cells - if one of these cells undergoes mitosis, how many chromosomes will be in each daughter cell? Upon the completion of meiosis, how many chromosomes will be in a fruit fly sperm or egg cell?

Answers:the same as the original cell since each chromosome is replicated before the split is complete. so for the fruit fly that has 8 the daughter cells after mitosis will also have 8 each. in the case of meiosis the number will be half that of the somatic cells so 4 for the fruit fly. (when they mate and the egg and sperm nucleus merge to form baby flies then the two 4s come together to form 8 again (somatic cells)

Question:and If the parent cell has a chromosome number of 2n=6, what will be the chromosome number of the daughter cells?

Answers:A parent cell, through mitosis, will create daughter cells with the same number of chromosomes as it has (diploid). Through meiosis (making of gametes) the parent cell will create cells that are haploid, so have half the number of chromosomes of the parent. These cells will have only one of the chromosomes from each pair.

Question:I thought the answer would be 5 chromosome in each daughter cell, but the answer sheet said 10 and it doesn't make sense how that worked. Can anyone tell me if its 5 or if it's 10 how did that happen.

Answers:The original diploid cell had 10 chromosome *pairs*. So the resulting haploid cells after meiosis would have 10 chromosomes (not pairs). The haploid cells would have only one of each type of chromosome.