Exam 7: Patterns of Inheritance

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

The figure shown below indicates two diseases with genetic links that are common in industrialized nations.The fact that both are about 80-90 percent avoidable indicates that

Mutations will affect the

Explain the relationship between the genotype and the phenotype of a given trait.

When comparing a human sperm cell to a skin cell from the same individual,what differences would be expected?

If Gregor Mendel had studied a polygenic trait that did not follow the straightforward single-gene,single-phenotype pattern,do you believe he would have been able to describe how genes are passed from parents to offspring? Justify your answer.

A pea plant that is heterozygous for the flower color gene makes gametes.What is the probability that a specific gamete contains the recessive allele for flower color?

The separation of two alleles into different cells during meiosis is Mendel's law of ________.

Which of the following statements is NOT true?

A Punnett square shows the possible ways that alleles combine to form________.

Which of the following statements explains how genetically identical plant clones can exhibit dramatic phenotypic variation?

Feather color in a certain species of bird is controlled by a pair of alleles that exhibit incomplete dominance.If birds that are homozygous for one allele are black and birds that are homozygous for the other allele are white,then heterozygous birds would be

In Mendel's controlled mating experiments,the individuals produced by crossing two true-breeding parents are referred to as

If an individual is a carrier for a recessive disorder (with one copy of the recessive allele)and his or her partner is also a carrier,what is the probability that they will produce a child affected by the disorder? Explain your answer.

How is Mendel's law of segregation represented in a Punnett square?

Gregor Mendel began his studies by crossing plants that bred true for flower color.One parent bred true for purple flower color and the other parent bred true for white flower color.The flower color purple is dominant and the flower color white is recessive.If Mendel had erroneously crossed purple-flowered plants that were not true-breeding with white-flowered plants,how would this have altered the first generation produced?

A chestnut-colored (red-colored)horse is mated with a cremello (cream-colored)horse.Over a 10-year period,all of their offspring are palominos (gold-colored).This pattern of inheritance is best explained by

The observable physical characteristics of an organism are known as its ________.

Up to 300 inherited diseases found in dogs are similar to human diseases.Based on the information shown below,why might it be easier to study the genetics of these diseases in dogs rather than in humans?

Miles is a student studying two Mendelian traits in a plant.He creates a Punnett square to examine the phenotype ratio in the F₂ generation.Interestingly,Miles finds that the phenotype ratio does not match up with the predicted phenotypes.He soon realizes that the two genes are physically linked to each other on the same chromosome.How would close physical proximity on the same chromosome affect the law of independent assortment?