What happens when gene mutations occur in sex cells. Can changes in the number of chromosomes affect health and development?.



What happens when gene mutations occur in sex cells

What happens when gene mutations occur in sex cells

People with Down syndrome typically have three copies of chromosome 21 in each cell, for a total of 47 chromosomes per cell. De novo mutations may explain genetic disorders in which an affected child has a mutation in every cell in the body but the parents do not, and there is no family history of the disorder. Mutations range in size; they can affect anywhere from a single DNA building block base pair to a large segment of a chromosome that includes multiple genes. Scientists have studied flies carrying Hox mutations that sprout legs on their foreheads instead of antennae! The color variation seen in this tulip is caused by a somatic mutation — one which occurred early in the development of this individual flower. If a mutation causes a cell to have three haploid sets, it is called triploidy. Most commonly, some cells end up with one extra or missing chromosome for a total of 45 or 47 chromosomes per cell , while other cells have the usual 46 chromosomes. Some really important phenotypic changes, like DDT resistance in insects are sometimes caused by single mutations. Down syndrome is an example of a condition that occurs due to nondisjunction in autosomal non-sex cells. A common form of aneuploidy is trisomy, or the presence of an extra chromosome in cells.

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Chromosomal Abnormalities, Aneuploidy and Non-Disjunction



What happens when gene mutations occur in sex cells

People with Down syndrome typically have three copies of chromosome 21 in each cell, for a total of 47 chromosomes per cell. De novo mutations may explain genetic disorders in which an affected child has a mutation in every cell in the body but the parents do not, and there is no family history of the disorder. Mutations range in size; they can affect anywhere from a single DNA building block base pair to a large segment of a chromosome that includes multiple genes. Scientists have studied flies carrying Hox mutations that sprout legs on their foreheads instead of antennae! The color variation seen in this tulip is caused by a somatic mutation — one which occurred early in the development of this individual flower. If a mutation causes a cell to have three haploid sets, it is called triploidy. Most commonly, some cells end up with one extra or missing chromosome for a total of 45 or 47 chromosomes per cell , while other cells have the usual 46 chromosomes. Some really important phenotypic changes, like DDT resistance in insects are sometimes caused by single mutations. Down syndrome is an example of a condition that occurs due to nondisjunction in autosomal non-sex cells. A common form of aneuploidy is trisomy, or the presence of an extra chromosome in cells. What happens when gene mutations occur in sex cells

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2 Comments

  1. The data in this study may be helpful for understanding mutation rates in humans and measuring how quickly we are evolving.

  2. As all the cells divide during growth and development, cells that arise from the cell with the altered gene will have the mutation, while other cells will not.

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