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MUTATION
MUTATION

... dental use of X rays, and the worldwide distribution of radioactive isotopes produced by nuclear fission. In this same paper, Muller made two tentative suggestions that were soon shown, by Muller himself and by others, to be incorrect: first, that “spontaneous” mutations might be largely or wholly d ...
Introduction to Genetics
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Introduction to Genetics
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Mendelian genetics complete
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... • LAW OF INDEPENDENT ASSORTMENT • Law of independent assortment states that a random distribution of alleles occurs during gamete formation. Genes on separate chromosomes sort independently during meiosis. – Ex: an organism heterozygous for seed color (Yy) crossed with another heterozygous organism ...
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Y chromosome



The Y chromosome is one of two sex chromosomes (allosomes) in mammals, including humans, and many other animals. The other is the X chromosome. Y is the sex-determining chromosome in many species, since it is the presence or absence of Y that determines the male or female sex of offspring produced in sexual reproduction. In mammals, the Y chromosome contains the gene SRY, which triggers testis development. The DNA in the human Y chromosome is composed of about 59 million base pairs. The Y chromosome is passed only from father to son. With a 30% difference between humans and chimpanzees, the Y chromosome is one of the fastest evolving parts of the human genome. To date, over 200 Y-linked genes have been identified. All Y-linked genes are expressed and (apart from duplicated genes) hemizygous (present on only one chromosome) except in the cases of aneuploidy such as XYY syndrome or XXYY syndrome. (See Y linkage.)
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