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Bio-Chp 24
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Inheritance of Sex
1.
Pairs of Homologs
1-22 = Autosomes
23 = Sex Chromosome
2.
XY= Male
XX= Female
Sex Linked Genes
1. genes that determine developement on the sex organs on 23rd chromosome
2. genes that have nothing to do with sex found on 23rd chromosome
3. genes are said to be sex linked
4.
X-Linked Genes
1. Duchenne Muscular Dystrophy
2. Hemophilia
3. Color Blindness
a. Blue-Green
b. Red- Yellow
Genotype and Phenotype for Color Blindness
B- Normal Vision
b- Color Blindness
Genotype Phenotype
X(B)X(B)-------Normal Vision- Female
X(B)X(b)-------Normal Vision/ Carrier- Female
X(b)X(b)-------Color Blindness- Female
X(B)Y----------Normal Vision- Male
X(b)Y----------Color Blindness- Male
Pedigree Charts
Used to show a pattern of inheritance for a particular trait through a series of generations
1. Autosomal Recessive Genetic Disorder
2. Autosomal Dominant Genetic Disorder
3. X-Linked Recessive Genetic Disorder
Autosomal Recessive Genetic Disorder
1. Neither parent has the disorder but their child does
2. Parents are carriers
Examples:
1. Cystic Fibrosis
2. PKU
3. Tay-Sachs
Autosomal Dominant Genetioc Disorder
1. Affected children usually have at least one affected parent
2. Affected parents can have
Author
chrissey
ID
49108
Card Set
Bio-Chp 24
Description
Chromosomal basis of Inheritance
Updated
2010-11-12T11:44:23Z
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