Suppose number of fingers and toes in the North American sas…

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.

X inactivation can cause mosaicism in mammalian females.  In…

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?

Coat color in the calico cat is one of the classic examples…

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?