Other Laws of Inheritance. Mendelian Genetics : characteristics controlled by dominant and recessive paired alleles Many traits follow the patterns outlined by Mendel’s Laws, many do not. Incomplete Dominance. Offspring heterozygous for a trait have an intermediate appearance .
Showing a Cross for Incomplete Dominance
of Mendel’s Monohybrid cross? (Tt xTt)
Possible Blood Types:
A, B, AB, O
Six genotypes are possible for blood:
These pictures are called karyotypes!
I’m a BOY!
I’m a GIRL!
Calico Cats: (Codominant X Linked Trait)
they have only one X chromosome and one Y
I’m always a girl!
Colorblindness: (Recessive X linked trait)
Hemophilia: (Recessive X-linked trait)
She must have been a “carrier”
Nondisjunction of Sex Chromosomes
Nondisjunction of Autosomes
Crossing Over and Linked Genes
Crossing Over: homologous chromosomes
line up during synapsis and exchange
genes will separate
when crossing over
The closer genes are
on the chromosome,
the less chance they
will be separated during
Sickle Cell Anemia: (Autosomal recessive)
I spread malaria!
Phenylketonuria (PKU):(Autosomal recessive)
Tay-Sachs Disease: (Autosomal Recessive)