INTRODUCTION TO GENETICS QUESTIONS AND CORRECT SOLUTIONS

INTRODUCTION TO GENETICS
QUESTIONS AND CORRECT SOLUTIONS


Cystic fibrosis is a genetic disorder. It is a recessive
trait that is determined by two alleles. Suppose two
parents each carry at least one recessive allele, but
neither of them has cystic fibrosis. Which statement
reflects the likelihood of a child of these parents
having cystic fibrosis?
The child may or may not have the disease because a
recessive gene from each parent may be passed on.
During an experiment, a scientist crosses a pea plant
that has purple flowers with a pea plant that has white
flowers. The plants that result from this cross in the
F1 generation have both purple and white flowers.
What can the scientist conclude?
The plants in the P generation were not true-breeding.
The flowchart below shows the three generations of a
cross between a pea plant that has yellow pods and a
pea plant that has green pods. Yellow pods are the
dominant trait. The flowchart is missing the labels that
describe the traits.
In which squares should the phrase "Yellow pods"
appear?
A, C, and D
If Mendel had crossed a true breeding dominant plant
with a true breeding recessive plant, in which of the
three generations is the recessive trait visible?