Exam 11: Single-Gene Inheritance and Meiosis Rock for a Cause

In the case of the Schallers,why doesn't their genotype correlate with their phenotype?

During meiosis,two processes occur that,together,create diverse combinations of genes in eggs and sperm.What are these two processes called?

One parent has one copy of a dominant allele for gene 87 and one recessive allele for Gene 87.The other parent has two copies of the recessive allele for Gene 87.What is the chance that their children will inherit the dominant condition (two copies of Gene 87)? You may need to draw a Punnett square to figure this out.

The primary medical problem with cystic fibrosis is that

Where is the CFTR protein found?

What are gametes?

Which describes a genotype heterozygous for a single trait?

Define the term phenotype.

If two individuals were heterozygous for freckles,which is a dominant trait,what percentage of their progeny would have freckles?

Sickle-cell anemia is a recessively inherited disease that causes red blood cells to become rigid and deformed.What is the probability that a child will have sickle-cell anemia if the father has the disease and the mother is heterozygous for the disease? What is the probability that a child will be a carrier? Use a Punnett square to show your work and use the letters "A" and "a" to designate dominant and recessive alleles,respectively.

A disease caused by gene X is an autosomal recessive disease but is modified by expression of a gene on another chromosome gene Y.If gene Y has at least one dominant allele,then the disease is aggressive and becomes evident at age 2.If gene Y has two recessive alleles,then the disease is mild and dormant until the age of 50.Two people who are heterozygous for both gene X and Y have a child.What are the chances the child will have the aggressive form of the disease?

In human gametes,how many possible allele combinations exist?

What are homologous chromosomes?

What is the principle of independent assortment?

How are gametes different from the rest of the body's cells?

In humans,after meiosis,one diploid cell produces

How many chromosomes do human sperm and egg cells have?

What does activation of the CFTR protein cause?

A woman has a child with cystic fibrosis,but she is unsure who the father is.One possible father has cystic fibrosis and the other does not.Is paternity certain? Why or why not?

Many genetically inherited disorders are lethal,causing death in either childhood or early adulthood.Imagine two genetically inherited diseases,both of which cause death at an average age of 25,but one disease is recessively inherited and the other disease is dominantly inherited.An examination of the entire population will likely indicate that the allele for the recessively inherited disease is much more common than the allele for the dominantly inherited disease.Why do you think this is?