Exam 1: Mendels Principles of Heredity

Using the product rule,one would calculate the probability of parents having six children who are all boys as (½)⁶.

The mouse agouti gene has one wild-type allele and several mutant alleles.

Genes A and B are required for colour.If A or B is absent (that is,aa or bb)the result is colourless.Give the genotypes and phenotypes for each F₁ and F₂ progeny of the cross AAbb × aabb

Which of the following is not useful in a complementation test?

The purposeful control over mating by choice of parents for the next generation is called

Assume that in guinea pigs,dark brown fur (B)is dominant to black fur (b).If you mate a homozygous black guinea pig with a heterozygous brown guinea pig,what proportion of the progeny will be black?

The blood groups A,B,and O are different types of

In some plants,a purple pigment is synthesized from a colourless precursor.In a cross between two plants,one purple and the other colourless,an F₁ generation was produced that was all-purple.The F₂ produced from the F₁ had 775 purple,200 red,and 65 colourless.What is the genotype of the parents?

An individual can be a heterozygote for one trait and a homozygote for another.

In rats,the gene for the pigment (P)is dominant to no pigment (p).The gene for black (B)is dominant to the gene for cream (b).If a pigment gene (P)is absent,genes B and b are inoperative.Predict the genotypes and phenotypes of the F₁ of a cross between a homozygous black rat and an albino homozygous for cream.

Lines that produce offspring carrying specific parental traits that remain constant from generation to generation are called

In Drosophila,forked (fk)bristles are recessive to normal (fk⁺)and glassy eyes (gls)are recessive to normal (gls⁺).If an F₁ heterozygous female is backcrossed to the homozygous wild-type male parent,predict the genotypes and phenotypes of the offspring.

People may inherit a specific genotype that predisposes them to cancer.However,not everyone with this genotype develops cancer;the occurrence of cancer in these individuals is dependent on environment.This is an example of:

A cross in which the traits carried by the male parent and the female parent are reversed.

Suppose that in plants,smooth seeds (S)are dominant to wrinkled seeds (s)and tall plants (T)are dominant to short plants (t).A tall plant with smooth seeds was backcrossed to a parent that was short and wrinkled.Assuming independent assortment,what proportion of the progeny is expected to be homozygous for short and wrinkled?

In corn,three dominant genes are necessary for aleurone colour.The genotype B_D_R_ is coloured.Any homozygous recessive for one gene is colourless.Predict the genotypes and phenotypes of the offspring of the cross BbDdRR × BbDdrr

If yellow and round phenotypes in peas are dominant,and pea shape and colour are each controlled by a single gene,you know the genotype of all peas that are green and wrinkled.

The law of segregation is a Mendelian law that states that both alleles must separate during gamete formation.

In the common daisy,the genes A and a and B and b represent two pairs of alleles acting on flower colour.A and B are required for colour.The alleles of these two genes show recessive epistasis.The two gene pairs together thus show duplicate recessive epistasis.Predict the genotypes and phenotypes of the F₂ of a cross between two colourless plants,one homozygous for A and the other homozygous for B.9 Black;7 colourless

For the cross AaBb × aabb,what proportion of F₁ offspring will be heterozygous for both gene pairs? Assume independent assortment.