Exam 10: Patterns of Inheritance

The figure below shows three generations in one of Mendel's experiments. According to the data in this figure, Mendel's F₂ generation contains many more purple flowers than white flowers. Which of the following is the best explanation of this observation?

Suppose D were dominant and d were recessive, and you could label the D allele in the P generation with a radioactive atom or substance. You create hybrids by mating your radioactive DD individuals to dd individuals. Finally, you cross two Dd individuals. In 1,000 offspring, how many would you predict would be radioactive?

One of the first medical tests a newborn receives determines if the child has phenylketonuria (PKU). PKU is the result of a mutation in a single gene that causes mental retardation and a host of other phenotypes (light hair and skin color, eczema, and a "mousy" smell). By detecting PKU early, doctor are able to reduce the effect of this condition with a modified diet. PKU is an example of

Which of the following observations refutes the blending theory of inheritance?

An individual with the genotype Aa mates with an individual with the genotype AA. Which of the following is true?