Lecture 13.0

• Blending inheritance is the theory that parental traits blend together to produce a new phenotype. (not proven)
• Inheritance of acquired characteristics is the theory that acquired characteristics are passed on to offspring. (not proven)
• Mendel performed a cross polination
• THe observable features of peas comprised the peas phenotype.
• Mendel worked with true breeding lines. (When/if mated with themselves, would produce identical offspring.
• Mendel used the true breeding lines to create hybrids.
• The first thing Mendel studied was if the peas were round or wrinkly.
• When the round seeds were mixed with the wrinkled seeds, they produced all round, which contradicted the blending inheritance theory because the trait disappeared.
• To determine if sex influenced inheritance, Mendel did a recipricoal cross with the same results.
• Results of Mendel's expiraments were inconsistent with both original hypothesises.
• Genotype- combination of alleles found in an individal.
• An individuals genotype has an effect on their phenotype.
• The principle of segregation is the idea that two members of gene cells segregate into different gamete cells.
• A capital letter represents a dominant gene, and a lowercase letter represents a recessive.
• Homozygous - Having two identical alleles of a particular gene, e.g. BB
• Heterozygous - Having two different alleles for a particular gene.
• A cross between two individuals that are both heterozygous for a trait is known as a monohybrid cross.
• A dihybrid cross is a mating of two heterozygous parents.
• Mendel's original results suppost independent assortment.