Mendel & Punnett
What is the phenotypic ratio of an Aa x Aa cross?
3:1
What happens in Incomplete Dominance?
Traits blend together
Which extra chromosome causes Down Syndrome?
Chromosome 21 (Trisomy 21).
What is a Karyotype?
A visual map of all the chromosomes in a cell.
What does it mean to be homozygous recessive?
Having two identical lowercase alleles (aa).
What type of inheritance is the AB blood type?
Codominance
Mention one symptom of Cystic Fibrosis.
Thick mucus in lungs and digestive system.
What is a point mutation?
A change in a single base pair of DNA.
In a Bb x bb cross, what is the % of white offspring (bb)?
50%
Why is colorblindness more common in males?
Because it is an X-linked recessive trait.
What is the genotype for Klinefelter Syndrome?
XXY
What is Aneuploidy?
Having an abnormal number of chromosomes.
State Mendel's 1st Law (Law of Segregation).
Alleles separate during gamete formation.
What are the 3 alleles for human blood types?
A, B, and O.
Which disorder causes sickle-shaped red blood cells?
Sickle Cell Anemia.
What happens in a chromosomal deletion?
A segment of the chromosome is lost or removed.
How many squares are in a dihybrid cross (AaBb x AaBb)?
16 squares
What is Polygenic Inheritance?
Traits controlled by multiple genes
What syndrome occurs with only one X chromosome (X0)?
Turner Syndrome.
Genotype vs. Phenotype: What is the difference?
Genotype is the DNA code; Phenotype is the physical trait.