1a. Cystic fibrosis is caused by a recessive allele that results in defective chloride channels in cell membranes. This causes chloride to accumulate outside cells and a build-up of mucus in various organs (particularly the lungs and liver).
Genetic testing has determined that a couple are both carriers of this allele(meaning they have a heterozygous condition). What is the probability that they will produce a child with cystic fibrosis?_______________
b. Huntington's disease is one of the few lethal genetic disorders that is due to a dominant gene.This is a degenerative disease of the nervous system that does not develop until later in life. Why don't we find many lethal dominantly-inherited disorders?
c. Pattypan squash are either white or yellow. You start growing
pattipans and find out that, if you want to get white patty pans, then at least one of the parents must be white. Which color is dominant?
d. Humans may have Rh+ blood or Rh- blood. Rh+ means the
person has a certain group of proteins on the surface of their red blood cells. In humans, Rh+ blood dominates Rh-. Normal hemoglobin dominates sickle cell hemoglobin (assume this gene is on a different chromosome than the one for Rh). If one parent is heterozygous for both genes and the other parent is heterozygous for Rh and homozygous for normal hemoglobin, what is the probability that they will produce a child who is homozygous dominant for both traits?