2. Vocabulary
• Probability – the chance an event will
occur
• Independent assortment – one of
Mendel’s principles that states that
genes for different traits can
segregate independently during the
formation of gametes
3. Vocabulary
• Gene – a factor that is passed from
parent to offspring
• Allele – one of a number of different
forms of a gene
5. Vocabulary
• Homozygous – having two identical alleles for
a particular gene
• Heterozygous – having two different alleles for
a particular gene
• Phenotype – physical characteristics of an
organism
– Example – widow’s peak or no widow’s peak
• Genotype – genetic makeup of an organism
– Example – RR, Rr, rr
6. Mendel’s Principles
• Biological characteristics are
inherited through units called
genes.
–Genes are passed from parents to
offspring
7. Mendel’s Principles
• Principle of Dominance – some alleles
are dominant and others are recessive
– Organism with at least one dominant allele
for a form of a trait will show that form of a
trait
– Organism with a recessive allele will show
that form only when the dominant allele is
not present
