Chapter 9: Patterns of Inheritance
 
Chapter Quiz
 
 Pre-Test   Activity Quiz   Chapter Quiz 

1 .       When did Gregor Mendel publish his main ideas about genetics? [Hint]



2 .       The cross-fertilization of two different varieties of pea plants will produce a(n) _____. [Hint]



3 .       In a certain plant, the alleles A, B, and C are dominant to the alleles a, b, and c. A plant with the genotype AABbcc will have the same phenotype as the plant with the genotype _____. [Hint]



4 .       Cystic fibrosis can be inherited even if neither parent has the disease. This is because the disease _____. [Hint]



5 .       Assume tall (T) is dominant to dwarf (t). If a homozygous dominant individual is crossed with a homozygous dwarf, the offspring will ______. [Hint]



6 .       Phenylketonuria is an autosomal recessive disorder. Using P and p to represent the alleles, what is the genotype of a phenylketonuric person? [Hint]



7 .       If a homozygous dominant is crossed with a homozygous recessive for a given trait, the offspring will be __________. [Hint]



8 .       In a cross between two heterozygotes (Aa), the next generation will be _____. [Hint]



9 .       In Mendel's monohybrid cross of purple-flowered and white-flowered peas, all members of the F1 generation were of the __________ phenotype because their genotype was __________ for the flower-color gene. [Hint]



10 .       Huntington's disease is due to an autosomal dominant allele. If a heterozygous male marries a normal female, what percentage of the offspring will have Huntington's? [Hint]



11 .       An allele is _____. [Hint]



12 .       Folk singer Woody Guthrie died of Huntington's disease, an autosomal dominant disease. Which statement below must be true? [Hint]



13 .       Homologous pairs of chromosomes frequently _____. [Hint]



14 .       An AABb individual is mated with another AABb individual. The possible number of genetically different kinds of offspring is _____. [Hint]



15 .       Pea flowers may be purple (W) or white (w). Pea seeds may be round (R) or wrinkled (r). What proportion of the offspring from the cross WwRr x WwRr will have white flowers and wrinkled seeds? [Hint]



16 .       A = big apples; R = red apples; a = small apples; r = yellow apples. You have one tree that produces big yellow apples and another tree that produces small red apples. When the two are crossed, you find that half the offspring trees produce big red apples and half produce big yellow apples. What are the genotypes of the parents? [Hint]



17 .       R = can roll tongue; r = can't roll tongue. A couple who both have the ability to roll their tongues have a son who is also a tongue-roller. The son is curious about whether he is homozygous or heterozygous for the tongue-rolling trait. How could he find out? [Hint]



18 .       Pea plants are tall if they have the genotype TT or Tt, and they are short if they have genotype tt. A tall plant is mated with a short plant. Half the offspring are tall, and half are short. This allows us to conclude that the tall plant _____. [Hint]



19 .       The results of a testcross (that is, the offspring of this cross) were 50% phenotypically dominant and 50% phenotypically recessive. The genotype of the phenotypically dominant parent in this cross was _____. [Hint]



20 .       What is indicated when a single-character testcross yields offspring in a 1:1 phenotypic ratio? [Hint]



21 .       Suppose we have a pea plant with purple flowers, determined by the dominant allele P. How might you determine whether the plant is homozygous (PP) or heterozygous (Pp)? [Hint]



22 .       If each parent can produce 100 genetically distinct gametes, how many genetically distinct offspring can two parents produce? [Hint]



23 .       Tay Sachs disease runs in Rebecca's family. On a family pedigree, she saw a shaded circle. This represented _____. [Hint]



24 .       John and Jane are planning a family, but since each has a brother who has sickle-cell disease, they are concerned that their children may develop sickle-cell disease. Neither John, Jane, nor their respective parents have the disease. They consult a genetic counselor who tells them that _____. [Hint]



25 .       When two average-height parents give birth to a child exhibiting achondroplastic dwarfism, it is most likely due to a new mutation. This is because _____. [Hint]



26 .       Cystic fibrosis, which is usually lethal before the age of reproduction, is a homozygous recessive trait. Why do cases continue to arise, even though people with the disease rarely reproduce? [Hint]



27 .       It is far more common to find human genetic disease caused by __________ alleles than by __________ alleles because __________. [Hint]



28 .       Michelle and Keith are apparently normal, but their daughter was born with alkaptonuria, an inherited metabolic disorder. If alkaptonuria is inherited like most other human hereditary disorders, the probability of their next child being born with alkaptonuria is _____. [Hint]



29 .       Huntington's disease is an example of a genetic disorder caused by _____. [Hint]



30 .       Several inherited disorders are much more common in close-knit religious communities, such as the Amish, than in the general population. This is at least partly due to the fact that _____. [Hint]



31 .       Fetal cells may be removed along with fluid from the womb by a process known as _____. [Hint]



32 .       A red bull is crossed with a white cow and all of the offspring are roan, a shade between red and white. This is an example of genes that are _____. [Hint]



33 .       Flower color in snapdragons is an example of incomplete dominance. If a red-flowered plant is crossed with a white-flowered plant, the F1 generation has pink flowers. If a pink-flowered plant is crossed with a pink-flowered plant, the progeny plants will be __________. [Hint]



34 .       A man who has type B blood and a woman who has type A blood could have children of which of the following phenotypes? [Hint]



35 .       Which of the following matings can NOT produce a child with blood type O? The letters refer to blood types (phenotypes). [Hint]



36 .       If one parent is blood type AB and the other is type O, what fraction of their offspring will be blood type A? [Hint]



37 .       A woman with type O blood is expecting a child. Her husband is type A. Both the woman's father and her husband's father had type B blood. What is the probability that the child will have type O blood? [Hint]



38 .       A single allele that controls more than one character is said to be _____. [Hint]



39 .       In people with sickle-cell disease the red blood cells break down, clump, and clog the blood vessels. The blood vessels and the broken cells accumulate in the spleen. Among other things this leads to physical weakness, heart failure, pain, and brain damage. Such a suite of symptoms can be explained by _____. [Hint]



40 .       In a testcross, the unknown individual is always crossed with a(n) _____. [Hint]



41 .       The inheritance of height and weight can best be described as _____. [Hint]



42 .       Seeds from a single sexually reproducing plant are harvested and later planted under identical conditions. What results should be expected? [Hint]



43 .       If two genes are linked _____. [Hint]



44 .       If hair color, eye color, and the presence or absence of freckles were consistently inherited together, the best explanation would be that _____. [Hint]



45 .       If the two traits that Mendel looked at in his dihybrid cross of smooth yellow peas with wrinkled green peas had been controlled by genes that were located close together on the same chromosome, then the F2 generation _____. [Hint]



46 .       In a particular species of mammal, black hair (B) is dominant to green hair (b), and red eyes (R) are dominant to white eyes (r). When a BbRr individual is mated with a bbrr individual, offspring are produced in a ratio of 5 black hair and red eyes : 5 green hair and white eyes : 1 black hair and white eyes : I green hair and red eyes. Which of these explanations accounts for this ratio? (9.19) [Hint]



47 .       In question 46, the observed distribution of offspring was: black-red 1,070; black-white 177; green-red 180; green-white 1,072. Based on these data, what is the recombination frequency? [Hint]



48 .       Close relatives who mate are more likely to have children with genetic diseases because _____. [Hint]



49 .       The crossover percentage between two different genes is _____. [Hint]



50 .       The Y chromosomes of mammals contain genes that code for ____________. [Hint]



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