Chapter_15_The_Chromosomal_Basis_of_Inheritance

Chapter_15_The_Chromosomal_Basis_of_Inheritance - Chapter...

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Chapter 15: Chromosomal Basis of Inheritance Alterations of Chromosomes: Any change in base order can lead to mutations. There are many different ways they can occur. a) Deletion removes a chromosomal segment. b) Duplication repeats a segment. c) Inversion reverses a segment within a chromosome. d) Reciprocal translocation moves a segment from one chromosome to another, nonhomologous one. It also involves chromosomes exchanging fragments. Chromosomal Systems: Different species have different chromosomal systems. a) The X-Y system is exhibited by humans and leads to XY males and XX females. b) The X-0 system is exhibited by grasshoppers and leads to X males and XX females. c) The Z-W system is exhibited by roosters and leads to ZZ males and ZW females. d) The haploid-diploid system is exhibited by bees and leads to haploid males and diploid females. Sex-linked Characteristics: Sex-linked characteristics can be found on the X- chromosome. Males are more likely
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Chapter_15_The_Chromosomal_Basis_of_Inheritance - Chapter...

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