Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Bio 113 - Chapter 14
| Question | Answer |
|---|---|
| 1) Pea plants were particularly well suited for use in Mendel's breeding experiments for all of the following reasons except that | D) peas have an unusually long generation time. |
| 2) What is the difference between a monohybrid cross and a dihybrid cross? | C) A dihybrid cross involves organisms that are heterozygous for two characters and a monohybrid only one. |
| 3) A cross between homozygous purple-flowered and homozygous white-flowered pea plants results in offspring with purple flowers. This demonstrates | C) dominance. |
| 4) The F1 offspring of Mendel's classic pea cross always looked like one of the two parental varieties because | A) one phenotype was completely dominant over another. |
| 5) What was the most significant conclusion that Gregor Mendel drew from his experiments with pea plants? | B) Traits are inherited in discrete units, and are not the results of "blending." |
| 6) How many unique gametes could be produced through independent assortment by an individual with the genotype AaBbCCDdEE? | D) 32 |
| 7) Two plants are crossed, resulting in offspring with a 3:1 ratio for a particular trait. This suggests | D) that the parents were both heterozygous. |
| 8) Two traits that appear in a 9:3:3:1 ratio in the F2 generation should have which of the following properties? | B) The genes controlling the traits obey the law of independent assortment. |
| 9) A sexually reproducing animal has two unlinked genes, one for head shape (H) and one for tail length (T). Its genotype is HhTt. Which of the following genotypes is possible in a gamete from this organism? | A) HT |
| 10) It was important that Mendel examined not just the F1 generation in his breeding experiments, but the F2 generation as well, because | B) parental traits that were not observed in the F1 reappeared in the F2. |
| 11) When crossing an organism that is homozygous recessive for a single trait with a heterozygote, what is the chance of producing an offspring with the homozygous recessive phenotype? | C) 50% |
| Figure 14.1 12) Which of the boxes marked 1-4 correspond to plants with dark leaves? | E) 1, 2, and 3 |
| 13) Which of the boxes correspond to plants with a heterozygous genotype? | D) 2 and 3 |
| 14) Which of the plants will be true-breeding? | A) 1 and 4 |
| 15) Mendel accounted for the observation that traits which had disappeared in the F1 generation reappeared in the F2 generation by proposing that | C) traits can be dominant or recessive, and the recessive traits were obscured by the dominant ones in the F1. |
| 16) Which of the following about the law of segregation is false? | E) It is a method that can be used to determine the number of chromosomes in a plant. |
| 17) The fact that all seven of the pea plant traits studied by Mendel obeyed the principle of independent assortment most probably indicates which of the following? | D) All of the genes controlling the traits behaved as if they were on different chromosomes. |
| 18) Mendel was able to draw his ideas of segregation and independent assortment because of the influence of which of the following? | E) His experiments with the breeding of plants such as peas |
| 19) Mendel's observation of the segregation of alleles in gamete formation has its basis in which of the following phases of cell division? | D) Anaphase I of meiosis |
| 20) Mendel's second law of independent assortment has its basis in which of the following events of meiosis I? | C) Alignment of tetrads at the equator |
| 21) Black fur in mice (B) is dominant to brown fur (b). Short tails (T) are dominant to long tails (t). What fraction of the progeny of the cross BbTt x BBtt will have black fur and long tails? | E) 9/16 |
| 22) In certain plants, tall is dominant to short. If a heterozygous plant is crossed with a homozygous tall plant, what is the probability that the offspring will be short? | B) 1/2 |
| Two true-breeding stocks of pea plants are crossed. blahh.If 1,000 F2 offspring resulted from the cross, approximately how many of them would you expect to have red, terminal flowers? | B) 190 |
| 24) In a cross AaBbCc x AaBbCc, what is the probability of producing the genotype AABBCC? | E) 1/64 |
| 25) Given the parents AABBCc x AabbCc, assume simple dominance and independent assortment. What proportion of the progeny will be expected to phenotypically resemble the first parent? | A) 1/4 |
| Labrador retrievers are black, brown, or yellow.26) These results indicate which of the following? 26) These results indicate which of the following? | E) Epistasis is involved. |
| 27) How many genes must be responsible for these coat colors in Labrador retrievers? | B) 2 |
| In one type cross of black x black, the results were as follows: 9/16 black 4/16 yellow 3/16 brownThe genotype aabb must result in which of the following? | C) Yellow |
| 29) If true-breeding red long radishes are crossed with true breeding white oval radishes, the F1 will be expected to be which of the following? | D) Purple and long |
| 30) In the F2 generation of the above cross, which of the following phenotypic ratios would be expected? | E) 6:3:3:2:1:1 |
| 31) Drosophila (fruit flies) usually have long wings If a homozygous bent wing fly is mated with a homozygous vestigial wing fly, which of the following offspring would you expect? | E) 1/2 bent and vestigial to 1/2 normal |
| 32) The flower color trait in radishes is an example of which of the following? | D) Incomplete dominance |
| 33) A 1:2:1 phenotypic ratio in the F2 generation of a monohybrid cross is a sign of | C) incomplete dominance. |
| 34) In snapdragons, heterozygotes for one of the genes have pink flowers, whereas homozygotes have red or white flowers. When plants with red flowers are crossed with plants with white flowers, what proportion of the offspring will have pink flowers? | C) 50% |
| Tallness (T) in snapdragons is dominant. A dwarf, red snapdragon is crossed with a plant homozygous for tallness and white flowers. What are the genotype and phenotype of the F1 individuals? | E) TTRR–tall and red |
| 36) Skin color in a certain species of fish is inherited via a single gene with four different alleles. How many different types of gametes would be possible in this system? | C) 4 |
| 37) In cattle, roan coat color (mixed red and white hairs) occurs in the heterozygous (Rr) offspring of red (RR) and white (rr) homozygotes. Which of the following crosses would produce offspring in the ratio of 1 red : 2 roan : 1 white? | A) red × white |
| Gene S controls the sharpness of spines in a type of cactus. At the same time, a second gene, N, determines whether cacti have spines. Homozygous recessive nn cactuses have no spines at all.38) The relationship between genes S and N is an example of | B) epistasis. |
| 39) A cross between a true-breeding sharp-spined cactus and a spineless cactus would produce | A) all sharp-spined progeny. |
| 40) If doubly heterozygous SsNn cactuses were allowed to self-pollinate, the F2 would segregate in which of the following ratios? | E) 9 sharp-spined : 3 dull-spined : 4 spineless |
| Feather color in budgies is determined by two different genes Y and B.41) A blue budgie is crossed with a white budgie. Which of the following results is not possible? | E) a 9:3:3:1 ratio |
| 42) Two blue budgies were crossed. Over the years, they produced 22 offspring, 5 of which were white. What are the most likely genotypes for the two blue budgies? | C) yyBb and yyBb |
| A woman who has blood type A positive has a daughter who is type O positive and a son who is type B negative.43) Which of the following is a possible partial genotype for the son? | D) IBi |
| 44) Which of the following is a possible genotype for the mother? | D) IAi |
| 45) Which of the following is a possible phenotype for the father? | C) B positive |
| 46) Which of the following is the probable genotype for the mother? | D) IAiRr |
| 47) If both children are of blood group MM, which of the following is possible? | A) Each parent is either M or MN. |
| 48) Which describes the ability of a single gene to have multiple phenotypic effects? | C) Pleiotropy |
| 49) Which describes the ABO blood group system? | A) Incomplete dominance |
| 50) Which of the following terms best describes when the phenotype of the heterozygote differs from the phenotypes of both homozygotes? | A) Incomplete dominance |
| 51) Cystic fibrosis affects the lungs, the pancreas, the digestive system, and other organs, resulting in symptoms ranging from breathing difficulties to recurrent infections. Which of the following terms best describes this? | C) Pleiotropy |
| 52) Which of the following is an example of polygenic inheritance? | E) Skin pigmentation in humans |
| 53) Hydrangea plants of the same genotype are planted in a large flower garden. Some of the plants produce blue flowers and others pink flowers. This can be best explained by which of the following? | A) Environmental factors such as soil pH |
| 54) Which of the following provides an example of epistasis? | C) In rabbits and many other mammals, one genotype (cc) prevents any fur color from developing. |
| 55) Most genes have many more than two alleles. However, which of the following is also true? | D) There may still be only two phenotypes for the trait. |
| 56) Huntington's disease is a dominant condition with late age of onset in humans. If one parent has the disease, what is the probability that his or her child will have the disease? | C) 1/2 |
| 57) A woman has six sons. The chance that her next child will be a daughter is | C) 1/2. |
| The following questions refer to the pedigree chart in Figure 14.2 for a family. 58) What is the genotype of individual II-5? | C) ww |
| 59) What is the likelihood that the progeny of IV-3 and IV-4 will have wooly hair? | C) 50% |
| 60) What is the probability that individual III-1 is Ww? | B) 1/4 |
| 61) People with sickle-cell trait | E) All of the above |
| 62) When a disease is said to have a multifactorial basis, it means that | A) both genetic and environmental factors contribute to the disease. |
| 63) An ideal procedure for fetal testing in humans would have which of the following features? | A) Lowest risk procedure that would provide the most reliable information |
| 64) A scientist discovers a DNA-based test for the allele of a particular gene. This and only this allele, if homozygous, produces an effect that results in death at or about the time of birth. Of the following, which is the best use of this discovery? | B) To design a test for identifying heterozygous carriers of the allele |
| An obstetrician knows that one of her patients is a pregnant woman The obstetrician would most reasonably offer which of the following procedures to her patient? | C) Amniocentesis |
| 66) The frequency of heterozygosity for the sickle cell anemia allele is unusually high, presumably because this reduces the frequency of malaria. Such a relationship is related to which of the following? | B) Mendel's law of segregation |
| 67) Cystic fibrosis (CF) is a Mendelian disorder in the human population that is inherited as a recessive. Two normal parents have two children with CF. The probability of their next child being normal for this characteristic is which of the following? | C) 1/4 |
| 68) Phenylketonuria (PKU) is a recessive human disorder This amino acid is not otherwise produced by humans. Therefore the most efficient and effective treatment is which of the following? | C) Regulate the diet of the affected persons to severely limit the uptake of the amino acid. |
| Hutchinson-Gilford progeria is an exceedingly rare human genetic disorder Which of the following represents the most likely assumption? | A) All cases must occur in relatives; therefore, there must be only one mutant allele. |
| 70) A pedigree analysis for a given disorder's occurrence in a family shows that, although both parents of an affected child are normal, each of the parents has had affected relatives with the same condition. The disorder is then which of the following? | C) Incompletely dominant |
| 71) One of two major forms of a human condition called neurofibromatosis (NF 1)If a young child is the first in her family to be diagnosed, which of the following is the best explanation? | B) One of the parents has very mild expression of the gene. |
| 56) Independent assortment of chromosomes is a result of | A) the random and independent way in which each pair of homologous chromosomes lines up at the metaphase plate during meiosis I. |
| 57) When pairs of homologous chromosomes separate during anaphase I, | B) the sister chromatids remain attached to one another. |
| 58) Natural selection and recombination due to crossing over during meiosis I are related in which of the following ways? | D) Recombinants may have combinations of traits that are favored by natural selection. |
Created by:
patel.1053