Case study jack and Diane R., a 25-year-old newlywed couple, reported to the emergency room with abdominal pain and diarrhea of 4 days’ duration. They stated that they initially thought they “picked up a summer stomach flu” because they recently returned from a 5-day camping trip. Jack added, “We were […]

You just bought two black guinea pigs from the pet store that are known to be heterozygous (Bb). You also know that black fur (BB) is dominant over white fur (bb), and that a lethal recessive allele is located only one cM away from the recessive b allele. You decide […]

Wild type e. coli can synthesize all 20 common amino acids, but some mutants, called amino acid auxotrophs, are unable to synthesize a specific amino acid and require its addition to the culture medium for optimal growth. Besides their role is protein sythesis, some amino acids are also precursers for […]

You make the following cross: Aa : Bb : Cc : Dd : Ee x Aa : Bb : Cc : dd : EE. If all capitol letter alleles show complete dominance and each of the genes is independently assorted, what proportion of the offspring will show the dominant phenotype […]