Mendel & Pedigrees

• Gregor Mendel is the father of genetics
• Gregor Mendel experimented with garden peas
• Peas have a "perfect" flower with both male and female reproductive parts
• Crosses of pea plants are made by removing anthers before pollen is produced and introducing pollen from a different strain
• In a cross, the F1 progeny will resemble one parent, defining the dominant version
• Recessive phenotype makes up about 1/4 of the progeny in the F2 generation
• Dominant traits are shown by a capital letter
• Recessive traits are shown by lowercase letters
• monohybrid: one gene cross
• TT and tt are homozygous
• Tt is heterozygous
• Alleles assort to gametes in a random fashion
• Independent genes have no influence on each other
• Each gamete must contain one allele from each trait
• alleles: alternate forms of a gene
• T/F:

  Two deaf persons have a child with normal hearing. This proves that deafness is dominant, and both parents are heterozygous.

  False
• T/F:

  Heritability of IQ is rather high. This means that much of the measured variation is the result of genetic differences.

  True
• T/F:

  Heritability of IQ is rather high. This means that IQ scores cannot be improved by improved environments.

  False