Chapter 3: Mendelian Genetics

  1. Punnett square practice

  2. If the two alleles at a locus differ, the organism is ________, and the ________ allele determines its ________.
    1. heterozygous, dominant, genotype.
    2. homoozygous, dominant, phenotype.
    3. homoozygous, recessive, phenotype.
    4. homoozygous, dominant, phenotype.
    5. heterozygous, dominant, phenotype.
  3. In the law of segregation, the two alleles for a heritable character end up in different
    1. chromosomes.
    2. chromatids.
    3. gametes.
    4. dyads.
    5. monads.
  4. A man was born with six fingers on each hand and six toes on each foot. His wife and their son have a normal number of digits. Having extra digits is a dominant trait. The couple's second child has extra digits. What is the probability that their next (third) child will have extra digits?
    1. 1/2
    2. 1/16
    3. 1/8
    4. 3/4
    5. 9/16
          • the man is heterozygous
  5. The ________ of alleles is a conseqnence of the random alignment of nonhomologous chromosomes in metaphase I.
    1. independent segregation
    2. independent assortment
    3. dominance
    4. cross-over
    5. mutation