Milestones Heredity EOCT Practice 1

The figure below shows a Punnett Square for an inherited trait.

The arrow is pointing to a circled genotype in the square.  What genotype does the circled “dd” represent?

Fruit flies have 3 chromosomes plus sex chromosomes (X and Y).  Mutations occurred within four different cells of an individual female fruit fly as shown in the table below.

Which of these mutations could be passed on to this fruit fly’s offspring?

The diagram below represents a cross between two pea plants.

In pea plants, the allele for round seeds (R) is dominant to the allele for oval seeds (r).  In a cross between the two plants above, what percentage of the offspring will have round seeds?

Which of the following best describes the inheritance of a sex-linked trait?

If a corn plant has a genotype of Ttyy, what are the possible genetic combinations that could be present in a single grain of pollen from this plant?

In certain breeds of dogs, deafness is due to a recessive allele (d) of a particular gene, and normal hearing is due to its dominant allele (D).  What percentage of the offspring of a normal heterozygous (Dd) dog and a deaf dog (dd) would be expected to have normal hearing?