Exam 4: Extensions Of Mendelism

Geneticists use the _______________________ to analyze the effects of matings between relatives.

The gene that controls Marfan's Syndrome causes abnormal heart defects,the presence of long limbs,the presence of increased height,and many other physical characteristics.It could be said that the gene that controls Marfan's Syndrome is:

Which of the following is the most appropriate representation of a codominant allele?

Non-functional alleles are said to be:

Which of the following is responsible for the discovery of the "one gene=one polypeptide" theory,which says that one gene is responsible for the formation of one polypeptide?

11 -If an individual has type O blood,what is the correct genotype for this individual? A) I^oi B) ii C) I^AI^o D) I^Bi E) It is impossible to tell based upon the information given.

The test to determine whether similar phenotypic mutations are alleles of the same gene based on the phenotypic effect of combining the mutations in the same individual is known as the:

Summer squash color is determined by the interaction of more than one gene.The presence of CC or Cc allele combinations produces a squash that is white in color,and the C allele is epistatic to the G allele.The presence of GG or Gg produces a squash that is yellow in color,and ccgg produces a squash that is green.After two heterozygous squash are crossed one of the offspring is CcGg.What is the color of the offspring squash?

On a national talk show a woman was claiming that a man was the father of her child.She had blood type AB.The child had type B.The suspected father had type O.The suspected father maintained the claim that since he had type O blood he could not be the father.You have been called in as an expert witness.Explain why or why not the man could be the father of the child.

In maize,overall kernel color is controlled by both the endosperm and the aleurone colors.The endosperm color is yellow when the allele Y is present.In the homozygous recessive (y/y)condition the endosperm is white.The Y alleles are masked by the presence of a colored aleurone.The R and Pr genes control the aleurone color.The allele Pr interacts with the R allele to produce a purple color,whereas in the recessive condition (pr/pr),the gene interacts with the R allele to produce a red color.If the R allele is present in the homozygous recessive state (r/r)then the aleurone will be colorless,allowing the endosperm color to be expressed.Two fully heterozygous individuals are crossed.Give the phenotypes,and frequency of occurrence,of the F2 offspring.

Which of the following is a disadvantage for creating inbred animal lines? 1.Increased genetic purity 2)Increased inbreeding depression 3)Increased rate of expression of harmful recessive alleles

The fraction of genes that two individuals share due to common ancestry is known as:

When individuals do not show a trait even though they have the appropriate genotype,the trait is said to exhibit:

A woman who is blood type AB has a child with a man who is blood type O.Which of the following is not a possible blood phenotype for the child produced from this union?

Which of the following can control gene activity?

Red snapdragons are crossed with white snapdragons and in the F1 generation this cross produces pink offspring.The allele (W)controlling the red color is considered to be:

The allele for polydactyly is dominant,but most individuals do not exhibit the polydactyly trait.Which of the following explains why this occurs in nature?

In mice,a cross between A^YA⁺ heterozygotes produces two kinds of progeny,yellow (A^YA⁺)and gray-brown (A⁺A⁺),in a ratio of 2:1.Why is there an altered ratio of individuals produced? A) A^YA^Yindividuals die during embryonic development due to the presence of a lethal mutation B) A^YA⁺individuals are physiologically more able to adapt to the birth process C) A⁺A⁺ individuals are the mutant phenotype and occur more frequently in nature D) A^YA⁺ individuals are the mutant phenotype and occur more frequently in nature E) None of these explains why there would be an altered ratio in this case

The inbreeding coefficient can be used to measure:

Allele b denotes blue eyes in humans and allele B for brown eyes is completely dominant over b.Alele b is partially dominant over bg (green eyes)and bh (hazel eyes).Allele bh is completely dominant over bg (green eyes)What is the dominance hierarchy for this trait?