Exam 4: Gene Interaction

What is the genotype for individuals with blood type O?

The Sbe1 gene controlling pea shape is an example of codominance at the molecular level;the inheritance pattern is seen by detection of how many DNA or RNA bands in heterozygous plants?

Most combinations of different ABO alleles result in complete dominance of one allele.Which combination results in codominance?

You have crossed two Mexican hairless dogs,and the offspring are 1/3 hairy and 2/3 hairless.Given this phenotypic ratio,draw the Punnett square for this cross.What are the genotypes of the P₁ and F₁ dogs in this cross? List the predicted genotype as well as the phenotype for each of the offspring.Which genotypes are hairless,and which are hairy? Can you design a genetic cross that would yield a true-breeding hairless line (where all offspring are hairless)?

What are the two categories of gain-of-function mutations?

The four different human blood types are caused by how many alleles?

A mutation resulting in an inactive gene product is classified as

Individuals with blood type A have which blood antigen(s)?

A metabolic reaction requires 40 units of enzymatic activity to proceed.If a dominant allele "D" can generate 40 units of enzyme and a mutant allele "d" generates 20 units of enzyme,what can be said of the dominant wild-type allele?

Mendel studied tall and short pure-breeding lines of pea plants.Inherited genetic variation would dictate that one line would produce tall plants and the other short plants,but the genes and phenotypes are influenced by what external factor?