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BONUS Question: A homozygous tall pea plant with terminal flowers (flowers on the ends of the stems) is crossed with a homozygous short plant that has axial flowers. All 72 offspring are tall with axial flowers. This is a dihybrid cross with the height and flower position traits showing independent assortment. (6 points) Name the dominant and recessive alleles for both the traits (height and position of the flowers). Give the genotypes of the parents and offspring in this cross. Predict the F2 offspring when the tall-axial F1’s are allowed to self-pollinate.

Mendel accounted for the observation that traits which had disappeared in the F1 generation reappeared in the F2 generation by proposing that  

Which of the following statements about molecular orbital (MO) theory are true?I.    According to MO theory, electrons are localized on specific atoms.II.   The linear combination of atomic orbitals method is used to generate molecular orbitals for a molecule.III.  The number of molecular orbitals created from the LCAO approach is identical to the number of atomic orbitals that were originally combined.IV.  Molecular orbital theory is a powerful bonding theory that accurately predicts structures of complex molecules.V.   The MOs that are generated are classified as either bonding, nonbonding, or antibonding.

Pea plants were particularly well suited for use in Mendel’s breeding experiments for all of the following reasons except that peas do not show the easily observed variations in a number of characters, such as pea shape and flower color.

A _______________ mutation removes DNA where as an ____________ mutation adds DNA.

Metacentric chromosome has two _____ arms, submetacentric chromosome has ______________ arms and acrocentric chromosome have centromere ______________.  

Mutations that occur only in an egg or sperm cell, or those that occur just after fertilization is known as genetic mutation.

If a plant with round seeds has a parent that has wrinkled seeds, then, what is its genotype? (Assume that round is dominant.)  

A point mutation that changes a codon specifying an amino acid into a stop codon is called a ______________ mutation.

Down’s syndrome is caused by_________________ and the risk of conceiving an offspring with Down’s syndrome rises dramatically with the age of the ___________.