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Hace 4 días · Crossing over is a cellular process that happens during meiosis when chromosomes of the same type are lined up. When two chromosomes — one from the mother and one from the father — line up, parts of the chromosome can be switched.
Hace 5 días · Crossing over plays a critical role in increasing the genetic variation among offspring of sexual reproduction. Crossing over is unique to meiosis. Its occurrence depends on specific events early in prophase I, and it has important consequences for the rest of meiosis and beyond.
Hace 3 días · Meiosis is a type of cell division in sexually reproducing organisms that reduces the number of chromosomes in gametes (the sex cells, or egg and sperm). In humans, body (or somatic) cells are diploid, containing two sets of chromosomes (one from each parent).
Hace 5 días · The process of meiosis creates 4 haploid gamete cells from a diploid cell. In animals these gametes are called eggs and sperm and in plants they are called eggs and pollen. For meiosis to occur it must go through two divisions, Meiosis I and Meiosis II.
Hace 4 días · During the formation of egg and sperm cells (meiosis), paired chromosomes from the male and female parents align so that similar DNA sequences can cross over, or be exchanged, from one chromosome to the other.
Hace 5 días · crossing over. While mitosis results in diploid daughter cells, meiosis results in haploid cells. Choose one of the following statements that best explains why meiosis results in haploid daughter cells rather than diploid daughter cells. DNA replication does not occur prior to the second cell division during meiosis.
Hace 6 días · Crossing over is an extremely important mechanism for increasing genetic diversity in animals. The frequency with which crossing over occurs between any two linked genes is proportional to the distance between them.
