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sec 11.3

Chromosomes and Human Heredity

A photograph of pairs of homologous chromosomes arranged in decreasing size. In a human this consists of 23 pairs, 22 pairs of autosomes and 1 pair of sex chromosomes Karyotype
this tool of genetics can help determine chromosome errors such as missing chromosomes or extra chromosomes Karyotype
During meiosis the sister chromatids may not separate properly, causing the wrong number of chromosomes in gametes and organisms...this is called ? Nondisjunction
Two chromosome conditions that can result from nondisjuction monosomy and trisomy
Having a set of three chromosomes of one kind is called trisomy
having only one of a particular type of chromosome is called monosomy
A condition that is the result of 3 #21 chromosomes ( a trisomy of #21) Down Syndrome
What factor causes the frequency of Down syndrome to increase older mothers
What problems come about as a result of Down Syndrome distinctive facial features, short, heart defects, and mental disabilities.
Types of chromosomes that can do go through nondisjuction autosomes and sex chromosomes
The normal sex chromosomes of a female are XX but with nondisjunction the sex chromosomes could be ______ ( a monosomy) or ______ ( a trisomy) XO or XXX
the normal male sex chromosomes are XY... two trisomy conditions that result from nondisjunction of male sex chromosomes are ____ or _____ XXY or XYY... ( the monosomy OY results in death)
Created by: shemehl



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