Exam 9: Patterns of Inheritance

Suppose D were dominant and d were recessive,and you could label the D allele in the P generation with a radioactive substance that could be inherited over several generations.You create hybrids by mating your radioactive DD individuals to dd individuals.Finally,you cross two Dd individuals.In 1,000 offspring,how many do you predict would be radioactive?

A tall plant mates with itself and produces all tall offspring.This cross is repeated for many generations with the same results.The parental plant is most likely

The first reaction in the chain of enzyme-catalyzed chemical reactions that convert the amino acid tyrosine into eumelanin or pheomelanin is orchestrated by an enzyme encoded by the C gene.Homozygotes for the recessive allele of this gene (cc)exhibit the ________ phenotype.

You are considering the inheritance of some human traits.One trait controls the quality of earwax,and it is controlled by the E gene.Wet earwax is dominant to dry earwax.Another trait is free or attached earlobes,represented by the A gene.Attached earlobes are recessive to free earlobes.Assume that a man who was pure-breeding for dry earwax and free earlobes had children with a woman who was pure-breeding for attached earlobes and wet earwax.What would be the genotype of their offspring?

In the cross depicted in the following illustration,two parent plants,one with red flowers and the other with white flowers,produce pink offspring.The white and red alleles for flower color in this plant exhibit

The following figure depicts red blood cells from a mother,a father,and their child.The mother and father are the biological parents of the child.What is the mother's genotype for ABO blood type?

The leaf color of a certain plant is controlled by one gene.For that gene,the allele G = orange and g = green.You have a plant with orange leaves,but do not know whether that plant's genotype is GG or Gg.Which of the following would help you determine the plant's genotype?

In the following Punnett square,the lettered circles on the top and left of the square (indicated by the arrows)represent the

Which of the following observations refutes the theory of blending inheritance?

During meiosis,two copies of a gene separate and end up in different ________.

Which of the following symbols correctly represents a person who has a homozygous genotype?

A pigment in mammals that is responsible for yellow to red hair color is

Two genes control fur color in Labrador retrievers.The first gene determines whether the pigment to be deposited in the hair will be black or brown.The second gene determines whether the pigments are put into the dog's hair at all.A dog homozygous for the recessive allele of this second gene will be yellow because no pigment is deposited in its fur.This is an example of

Before Gregor Mendel,it was believed that offspring should be intermediate in phenotype to their two parents and that it should be impossible for "lost" traits to reappear in later generations.This idea was known as ________ inheritance.

When two individuals who are heterozygous for a gene are mated,we would predict a dominant to recessive phenotypic ratio of ________ in the offspring.

Which of the following expresses Mendel's law of segregation?

Polygenic inheritance combined with environmental influence typically produces a wide range of phenotypic classes that grade smoothly from one to the next.This type of pattern is known as

Cystic fibrosis is caused by a recessive gene.If C = normal and c = cystic fibrosis,how can a child with cystic fibrosis have two parents who do not have cystic fibrosis?

Inheritance of ABO blood type in humans is an example of

Traits that are determined by the effect of more than one gene are known as polygenic.