Exam 9: Patterns of Inheritance

In a genetic cross of Gg with Gg guinea pigs,none of the four offspring were gg.This outcome

The following figure shows three generations in one of Mendel's experiments.According to the data in this figure,Mendel's F₂ generation contains many more purple flowers than white flowers.Which of the following is the best explanation of this observation?

Many genes contain instructions for building

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

Most human genetic traits are

The individuals Mendel observed in the F₁ generations were always

When a ________ variety of a plant is self-fertilized,all of its offspring have the same phenotype as the parent.

The first generation of phenotypes resulting from a genetic cross between two members of the parental generation would be seen in the ________ generation.

Siamese cats have dark fur on their extremities (paws,nose,ears,and the tail),while the rest of their bodies are covered with lighter hair,despite the fact that only one gene controls their coat color.Why does the coat color differ at different places on a Siamese cat's body?

If the D allele is completely dominant over the d allele,what percentage of the offspring will have the dominant phenotype when two heterozygous individuals mate?

An individual with the genotype Aa mates with an individual with the genotype AA.Which of the following is true?

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

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

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.

The best way to get accurate results from a probability exercise is to

Humans have many genes that contribute to the unique array of proteins found on their red blood cells.Your MN blood type (the letters indicate the presence of M and N proteins on the red blood cells)is determined by the codominant alleles Lᴹ and Lᴺ.Which of the following genotypes could NOT be produced when a man with MN blood and a woman with MN blood mate?

If the influence of two alleles is fully displayed in the heterozygote without being diminished by the presence of the other allele or being suppressed by a dominant allele,the two alleles are said to be ________.

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?

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?

The genetic makeup of an organism,such as Gg,is its ________.