Chromosomal Theory of Inheritance
Mitosis:
 
 
Meiosis:
 
 
Problems:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
X-Linked Inheritance:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
FlyLab:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Tutorial
· Animation and description of phases of mitosis
 
Tutorial
· Animation and description of phases of meiosis
 
1. Mitosis
· Stages of cell cycle
· "c" vs "n"
· DNA replication, sister chromatids, homologous chromosomes
· Mitotic division phases
· Alleles on sister chromatids
· Drag and drop chromosomes to emulate mitosis
 
2. Meiosis
· Consequences of sexual reproduction without meiosis
· Drag and Drop chromosomes to emulate meiosis I
· Drag and Drop chromosomes to emulate meiosis II
· Number of gametes formed
· Phases of meiosis, values of c, n
· Karyotypes
· Sex chromosomes
 
3. Independent Assortment
· Drag and Drop two pairs of chromosomes to emulate meiosis I
· Gametes formed during meiosis II
· Linkage: independent assortment of chromosomes not necessarily markers
 
4. Microscopy
· Mitosis vs meiosis
· "c" vs "n"
· haploid vs diploid
 
Problems
 
1. X linked recessive trait
· Dominant vs recessive
· X linked vs autosomal
· Genotypes
 
2. X linked recessive trait (Hemophilia)
· Genotypes
· Probability of affected children
 
3. X linked dominant trait (Vitamin D rickets)
· Dominant vs recessive
· X linked vs autosomal
· Genotypes
· Probabilities
 
4. X linked common recessive trait (Red green colorblindness) and Sickle cell anemia (autosomal recessive)
· Independent Assortment
· Probabilities
 
5. Nondisjunction
· Colorblindness and Turner syndrome
· Colorblindness and Klinefelter syndrome
· Identify parent where nondisjunction occurred
· Nondisjunction in Meiosis I or II
· White eyes in flies
· Sex determination in flies
 
1. Monhybrid cross, recessive (brown)
· Dominant vs recessive
· Drosophila nomenclature
· Genotypes
· Testcross
· Phenotypic ratios
 
2. Monohybrid cross, dominant (lobed)
· Dominant vs recessive
· Drosophila nomenclature
· Genotypes
 
3. Monohybrid cross, X linked recessive (white)
· Reciprocal crosses to F2
· Dominant vs recessive
· X linked vs autosomal
· Drosophila nomenclature
· Genotypes
· Phenotypic ratios
 
4. Monohybrid cross, X linked dominant (Bar)
· Reciprocal crosses to F2
· Dominant vs recessive
· X linked vs autosomal
· Drosophila nomenclature
· Genotypes
· Phenotypic ratios
 
5. Dihybrid cross, two autosomal recessives (ebony, purple)
· Dominant vs recessive
· X linked vs autosomal
· Genotypes
· Phenotypic ratios
· Testcross
· Testcross ratios
 
6. Dihybrid cross, X linked and autosomal (sable, dumpy)
· Reciprocal crosses
· Dominant vs recessive
· X linked vs autosomal
· Genotypes
· Phenotypic ratios
· Testcross
· Testcross ratios