BCH 206 CA

The AB blood type in humans, where both A and B antigens are expressed equally, is an example of:

• codominance

• incomplete dominance

• polygenic inheritance

• overdominance

In pea plants, the trait for tall stems (T) is dominant over the trait for short stems (t). If a homozygous tall plant is crossed with a homozygous short plant, what will be the genotype of the offspring?

• TT and tt

• TT

• Tt

• tt

Which of the following best describes the inheritance pattern where one gene affects the expression of another gene?

• pleiotropy

• epistasis

• linkage

• polygenic inheritance

A single gene that affects multiple, seemingly unrelated phenotypic traits is said to be:

• Epistatic

• Polygenic

• Pleiotropic

• Hemizygous

Which of the following is the universal start codon?

• UAG

• AUG

• UGA

• UAA

Which enzyme is responsible for the formation of peptide bonds during translation?

• Aminoacyl-tRNA synthetase

• Peptidyl transferase (a ribozyme)

• RNA Polymerase I

• DNA Ligase

If a woman with a mitochondrial disease has children with an unaffected man, what is the probability her children will inherit the condition?

• 0%

• 50%

• 100%

• 25%

Which of the following describes the 'Central Dogma' of molecular biology?

In the genetic code, what does it mean that the code is 'triplet'?

• Protein synthesis occur in 3 distinct stages

• Each gene is transcribed 3 times before translation

• Each amino acid is defined by a sequence of 3 nucleotides called a codon

• There are 3 nucleotides involved in translation

Which non-Mendelian inheritance pattern is seen in human blood types where an individual with I^A I^B genotype expresses both A and B antigens?

• incomplete dominance

• codominance

• complete dominance

• multiple allele