Exam 9: Patterns of Inheritance

Achondroplasia Achondroplasia is an autosomal dominant disorder, however homozygous dominant individuals do not have achondroplasia - they either die before birth or very shortly thereafter. The homozygous recessive condition is normal. A dwarf couple decide to have children. Use this information to answer the following question(s). In the example above, what is probability that the couple will have a child with achondroplasia?

In the Bombay phenotype, a gene in the recessive condition blocks the expression of A and B red blood cell antigens. Thus, all A, B, and AB genotypes are expressed as the O phenotype. This is an example of

Regarding the dominant theory of inheritance before Mendel's theory, which of the following is the closest analogy to "genes"?

Down syndrome is a trisomy that involves chromosome number

Which of the following prenatal tests can be performed earliest in a pregnancy?

In cows, certain coat colors are co-dominant. For example red is dominant; white is recessive; roan (red and white) is co-dominant. If a roan bull is crossed with a white cow what will be the expected coat colors of the calves?

Which of the following is NOT a single gene trait?

The mutated gene that causes cystic fibrosis is

Cystic fibrosis is a recessive disorder. If a couple, each of whom is heterozygous, have children, what is the probability that they will have a child with cystic fibrosis?

When is preimplantation diagnosis performed?

Which of the following is the most fatal genetic disorder in the United States?

In the second generation of a cross of DDRR with ddrr the most common genotype would be

Humans have an MN gene that codes for a red blood cell antigen. The gene has two alleles, M and N. When the two alleles are inherited together, MN, both are expressed. This is an example of

Which of the following was unknown to Mendel?

Which of the following is the normal path of a normal "cystic fibrosis" protein?

Pleiotropic genes

Which of the following represents an monohybrid cross?

What percent of plants are polyploids?

In a family pedigree that followed several generations, Gaucher's disease was found in family members every other generation and equally in males and females. Gaucher's disease is most likely a ______ disease.

Which of the following determines an observable trait?