Construct a family pedigree of two unaffected parents with a child who suffers from cystic fibrosis.

Predict the phenotype of offspring from a test cross between a seedless orange (ss) and an orange with seeds (Ss).

Suppose genes C and D are linked on one chromosome and genes c and d are linked on another chromosome. Assuming that crossing over does not take place, sketch the daughter cells resulting from meiosis, showing the chromosomes and position of the genes.

Describe how polyploidy is used in the field of agriculture.

Describe three traits that might be desired in sheep. How can these traits be passed on to the next generation? Explain.

Phenylketonuria (PKU) is a recessive genetic disorder. If both parents are carriers, what is the probability of this couple having a child with PKU? What is the chance of this couple having two children with PKU?

Evaluate whether having sickle-cell disease would be advantageous or disadvantageous to a person living in central Africa.

Suppose both parents can roll their tongues but their son cannot. Draw a pedigree showing this trait, and label each symbol with the appropriate genotype.

A breeder performs a test cross to determine the genotype of a black cat. He crosses the black cat (BB or Bb) with a white cat (bb). If 50 percent of the offspring are black, what is the genotype of the black cat?

What is the chance of producing a son with normal vision if the father is color-blind and the mother is homozygous normal for the trait? Explain.

Analyze how twin studies help to differentiate the effects of genetic and environmental influences.

Identify the blood group that results from each combination of genotypes. The first one has been done for you.

$$\begin{matrix} \text{Possible Genotype Combinations} & \text{Phenotypes}\\ \text{A and A} & \text{A}\\ \text{A and B}\\ \text{A and O}\\ \text{B and B}\\ \text{B and O}\\ \text{O and O}\\ \end{matrix}$$

A Punnett square for cystic fibrosis genotype

Physics $\&$ Now ${ }^{\text {r* }}$ A solid 2.0-kg ball of radius $0.50 \mathrm{~m}$ starts at a height of $3.0 \mathrm{~m}$ above the surface of the Earth and rolls down a $20^{\circ}$ slope. A solid disk and a ring start at the same time and the same height. The ring and disk each have the same mass and radius as the ball. Which of the three wins the race to the bottom if all roll without slipping?