The roseatte spoonbill is a bird that lives in mangrove marches and captures insects with a long spoon-shaped bill.  Bill color is due to a gene that has two incompletely dominant allele.  Individuals that are homozygous for one allele have a black bill.  Individuals that are homozygous for the other allele have a bill that is almost white.      a.  What color bill do heterozygotes most likely express?      b.  Explain the reasoning/rationale behind your answer to a.

In the space provided, describe one characteristic in the expression of a polygenic trait in a population.

Suppose number of fingers and toes in the North American sasquatch is an X-linked trait represented with the letters A and a.  The dominant allele results in polydactyly, more than 5 fingers on hands and more than 5 toes on feet.  The recessive allele results in “normal” number of fingers and toes, 5 fingers on hands and 5 toes on feet.  Which of the following genotypes would result in a sasquatch with the normal number of fingers and toes?  Select all correct choices.

Which one of the following best describe the product of a gene?

Which one of the following is not one of the major mechanism by which the environment may influence the expression of a gene?

Match the allele combination with the correct term used to describe that genotype combination.

X inactivation can cause mosaicism in mammalian females.  In mosaicism, the phenotype associated with a particular X-linked gene differs in various parts of the body.  A good example is the tortoiseshell cat, which expresses orange fur in some parts of her body and black fur in other parts of her body.  Which one of the following best describe the genotype associated with a mosaicism phenotype?

Blah   Blah

Which one of the following best describes the relationship between allele dominance and frequency of the allele in the population?

Coat color in the calico cat is one of the classic examples of X-inactivation.  Examine the illustration of the tortoiseshell cat below and answer the associated questions.        a.  Which X-linked allele is inactive in the orange patches of the calico cat?      b.  Which X-linked allele is inactive in the white areas of the calico cat?      c.  Is this cat most likely a female or a male?  How do you know?