Exam 8: Inheritance, Genes, and Chromosomes

Use the following to answer questions : Agouti is a type of coat color pattern in mouse that cannot be expressed in albinos (white mice).Nonalbino mice without the dominant agouti allele (AAbb and Aabb)are black.An agouti mouse that is heterozygous at the albino (A)and agouti (B)loci (AaBb)is mated to an albino mouse that is heterozygous at the agouti locus (aaBb). -What percent of the progeny are likely to be black?

In mice,short hair is dominant to long hair.If a short-haired individual is crossed with a long-haired individual and both long- and short-haired offspring result,one can conclude that

Use the following to answer questions : In a species of tortoise,foot size (big or small)is controlled by one gene,while shell shape (round or lumpy)is controlled by another gene.Suppose that a big-footed lumpy-shelled tortoise mates with a small-footed round-shelled tortoise.Eight offspring result: four big-footed round-shelled tortoises and four small-footed round-shelled tortoises.(Assume that the parents are not necessarily homozygous for each allele. ) -Which statement about the inheritance of shell shape in tortoises is most likely to be correct,given your genetic analysis of the tortoise family?

In tomatoes,tall is dominant to short and smooth fruits are dominant to hairy fruits.A plant that is homozygous for both dominant traits is crossed with a plant that is homozygous for both recessive traits.The F₁ progeny are tested and crossed with the following results: 78 tall smooth fruits;82 short hairy fruits;22 tall hairy fruits;and 18 short smooth fruits.These data indicate that the genes are

In the ABO blood groups in humans,

Use the following to answer questions : Agouti is a type of coat color pattern in mouse that cannot be expressed in albinos (white mice).Nonalbino mice without the dominant agouti allele (AAbb and Aabb)are black.An agouti mouse that is heterozygous at the albino (A)and agouti (B)loci (AaBb)is mated to an albino mouse that is heterozygous at the agouti locus (aaBb). -What percent of the progeny are likely to be agouti?

Segregation of alleles occurs

If an infant born to a mother with blood type O is also type O,possible genotypes for the father are

Which statement about an individual that is homozygous for an allele is false?

In Netherlands dwarf rabbits,a gene showing intermediate inheritance produces three phenotypes.Rabbits that are homozygous for one allele are small;individuals that are homozygous for the other allele are deformed and die;heterozygous individuals are dwarf.If two dwarf rabbits are mated,what proportion of their surviving offspring should be dwarf?

The genes contained in bacterial plasmids can be involved in

When a given trait is the result of multigene action,one of the genes may mask the expression of one or all other genes.This phenomenon is termed

In garden peas,the allele for tall plants is dominant over the allele for short plants.A true-breeding tall plant is crossed with a short plant,and one of their offspring is test crossed.Out of 20 offspring resulting from the test cross,about _______ should be tall.

In humans,spotted teeth are caused by a dominant sex-linked gene.If a man with spotted teeth whose father had normal teeth has children with a woman with normal teeth,

If the allele for tall (T)plants is incompletely dominant over the allele for short (t)plants,what will be the likely phenotype of the offspring resulting from a cross between two Tt plants?

Which statement about a test cross is false?

Which of the following is not a characteristic that makes an organism suitable for genetic studies?

The blue sclera allele has 90 percent penetrance for producing blue sclera,60 percent penetrance for fragile bones,and 40 percent penetrance for deafness.If these probabilities of penetrance are independent,_______ percent of individuals with the blue sclera allele will have deafness,blue sclera,and fragile bones.

A human male carrying an allele for a trait on the X chromosome is

In a(n)_______ cross,genes for two different characters separate.