Biology Chapter 12 Powerpoint

Etc no matter how many x chromosomes no presence of y

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: le presence Turner and Klinefelter Syndromes 28 Chromosome Number: Abnormal Sex Chromosome Number 29 Chromosomal Inherit Ploy-X females XXX simply taller & thinner than usual Some learning difficulties Many menstruate regularly and are fertile More than 3 Xs renders severe mental More retardation retardation Jacob’s syndrome (XYY) Tall, persistent acne, speech & reading Tall, problems problems 30 Chromosomal Inherit Abnormal Chromosome Structure Deletion Missing segment of chromosome Lost during breakage Translocation A segment from one chromosome moves to a segment non-homologous chromosome non-homologous Follows breakage of two nonhomologous Follows chromosomes and improper re-assembly chromosomes Deletion, Translocation, Duplication, and Inversion 31 32 Chromosomal Inherit Abnormal Chromosome Structure Duplication A segment of a chromosome is repeated in segment the same chromosome the Inversion Occurs as a result of two breaks in a Occurs chromosome chromosome ­ The internal segment is reversed before reinsertion ­ Genes occur in reverse order in inverted Genes segment segment Inversion Leading to Duplication and Deletion 33 34 Chromosomal Inherit Abnormal Chromosome Structure Deletion Syndromes Williams syndrome - Loss of segment of Williams chromosome 7 chromosome Cri du chat syndrome (cat’s cry) - Loss of Cri segment of chromosome 5 segment Translocations Alagille syndrome Some cancers Williams Syndrome 35 Alagille Syndrome 36 37 Chromosomal Inherit Review X-Linked Alleles Human X-Linked Disorders Gene Linkage Crossing-Over Chromosome Map Changes in Chromosome Number Changes in Chromosome Structure Human Syndromes Ending Slide Chapter 12 Chromosomal Inhe...
View Full Document

This note was uploaded on 01/22/2012 for the course BIOLOGY SC Bio Sci 93 taught by Professor Dr.dianeo'dowdanddr.rahulwarrior during the Summer '10 term at UC Irvine.

Ask a homework question - tutors are online