Exam 4: Gene Interaction

Gene interactions in which an allele of one gene modifies or prevents expression of alleles of another gene is known as

Refer to the the table to answer the following questions. -In the biosynthetic pathway for conversion from homoserine to methionine,you identify a Neurospora crassa double mutant Met1/Met2.This mutant will grow only if which supplement(s)are added to the minimal media?

Refer to the the table to answer the following questions. -Two pure-breeding mutant plants produce white flowers.When they are crossed,all of the progeny have wild-type purple flowers.What does this genetic complementation tell you?

An individual is a "universal acceptor," meaning he or she will not have an adverse reaction to a transfusion with any type of blood,has which blood type?

In familial hypercholesterolemia,individuals who are homozygous for the mutation lack LDL cholesterol receptors in the liver,causing high levels of serum cholesterol.This is a defect in which type of gene pathwaythe biosynthetic,signal transduction,or developmental pathway?

Bateson and Punnett crossed two white-flowered lines and saw all purple flowers in the F₁ generation.They concluded this was an example of complementary gene interactions because a cross of the F₁ plants yielded what ratio in the F₂ generation?

Which mode of inheritance results in the phenotype of a heterozygote being indistinguishable from that of an organism homozygous for the dominant allele?

You cross a white flower with a red flower,and the offspring are white with red spots.This is an example of what type of inheritance?

If a dominant allele of one gene completely suppresses the phenotypic expression of alleles of another gene,this is an example of

Are loss-of function mutations more likely to be dominant or recessive?

Numerous genes contribute to the wild-type red eye color in Drosophila.Two genes,brown and vermilion,produce eye pigments.What does the white gene do?

Refer to the the table to answer the following questions. -Independent assortment predicts a 9:3:3:1 ratio with four different phenotypes in the F₂ progeny.If the alleles are epistatic,what would you predict?

King George III of England and other members of the royal family were afflicted with a series of strange,seemingly unrelated symptoms including abdominal pain,rapid pulse,convulsions,and insanity.It has been determined that he likely suffered from porphyria,caused by a mutation in a single allele.What is the genetic term describing the alteration of multiple,distinct traits of an organism by a mutation in a single gene?

Individuals with blood type AB have which blood antibody(ies)?

To better understand which genes are involved in developmental pathways,geneticists use experimental analyses of mutant phenotypes.What is this analytic approach called?

You cross a white flower with a red flower,and the offspring are all pink.This is an example of what type of inheritance?

Which antigen,expressed on the surface of all red blood cells,is modified by A- or B-transferases?

Describe the difference between incomplete penetrance and variable expressivity.It is often difficult to pinpoint the cause of incomplete penetrance or variable expressivity.What possible interactions may be responsible?

The 9:6:1 ratio seen in the dihybrid cross of summer squash indicates what genetic relationship between the two genes controlling fruit shape?

Which mode of inheritance results in both alleles being detected equally in the heterozygous phenotype?