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Chapter 8: Problem 27

What is mosaicism? How is it produced?

Short Answer

Expert verified
Mosaicism is a condition where an organism has cells with different genetic material. It is produced as a result of a mutation that occurs in an early stage of development, leading to different genotypes in different cells. There are various types of mosaicism, such as somatic mosaicism and germline mosaicism, depending on which cells are affected by the mutation.

Step by step solution

01

Definition of Mosaicism

Mosaicism is a condition in biology where an organism or tissue has cells with different genetic material. That is, within one individual, there exist at least two types of cells with different genotypes.
02

How Mosaicism Occurs

Mosaicism is typically caused by a mutation that occurs in an early stage of development, after fertilization. If a mutation occurs during an early cell division, it can lead to a situation where some of the body's cells have the mutation and some do not. Thus, one organism is a mix, or mosaic, of cells with different genotypes.
03

Types of Mosaicism

Two common types of mosaicism are somatic mosaicism and germline mosaicism. Somatic mosaicism is when the mutation occurs in a body cell and can affect all cells that come from the original mutated cell. It does not impact the individual鈥檚 offspring. Germline mosaicism occurs when the mutation affects the germ cells (cells that develop into sperm or eggs). It does not usually affect the individual, but the mutation can be passed on to their offspring.

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