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A duplication is a structural change in chromosomes that causes doubling of a chromosome segment. The size of the doubled segment can vary considerably. Chromosome duplications are generally more tolerated by an organism than chro mosome deletions. Duplications can occur within a chromosome or among nonhomologous chromo
Centrosome and centromere are two components involved in the division of a cell. A centrosome is an organelle which is made up of microtubules. It nucleates all the microtubules inside a cell in...
I. G1 phase (Gap 1) - Cellular contents excluding the chromosomes, are duplicated. II. S phase (DNA Synthesis) - Each of the 46 chromosomes are duplicated by the cell. III. G2 phase (Gap 2) - The Cell “double checks” the duplicated chromosomes for error, making any needed repair.
Label the following figure and summarize what occurs at the DNA level in each stage. The top figure shows one chromosome. The middle figure shows a duplicated chromosome with two sister chromatids.
Chromosome sections can be duplicated during the formation of eggs or sperm or during the complicated replication process that is needed to produce new cells as we grow and develop. Sometimes similar duplications occur in unrelated people due to regions of repetitive DNA.
Karyogram: a diagram or photograph of the chromosomes of a cell, arranged in homologous pairs and in a numbered sequence, also called idiogram. G banding, or Giemsa banding is a technique used in cytogenetics to produce a visible karyotype by staining condensed chromosomes.
Meiosis I divides homol-ogous chromosomes, producing two haploid cells with duplicated chromo-somes. Like mitosis, scientists describe meiosis in terms of phases, illustrated in below. The figure is simplified, showing only four chromosomes.
