1. In cats, black color is caused by a sex-linked (X-linked) allele; alternative
ID: 174944 • Letter: 1
Question
1. In cats, black color is caused by a sex-linked (X-linked) allele; alternative allele at this locus vauses orange color. The heterozygote is tortoiswshell. What kind of foffspring would you expect from the across of a black female and organge male.
a. Orange female, orange male
b. Tortoiseshell female, tortoiseshell male
c. Black female, orange male
d. Tortoiseshell female, black male
2. The location of the gene on chromosome is known as the
a. Locus
b. Allele
c. Genotype
d. Phenotype
3. Eye color is governed by simple (complete) dominance. A homozygous recessive organism is crossed with a heterozygous organsim. What is the chance of getting an offspring with the homozygous recessive genotype?
a. 50%
b. 0%
c. 100%
d. 25%
4. A person with type AB blood illustrates the pattern of inheritance known as
a. Polygentic inheritance
b. Codominace
c. Incomplete dominance
d. Pleiotrophy
5. A person has the genotype BB. That person would be described as_____ for that trait.
a. Heterozygous dominant
b. Heterozygous
c. Homozygous recessive
d. Homozygous dominant
6. An animal has the genotype HhTt. Which of the following could be an allele combination found in a gamete from this organism
a. Hh
b.HT
c.T
d. HhTt
7. Joan has type AB blood. She marries Jason who has type O blood. What blood types are possible in ther children?
a. AB only
b. O and AB
c. A and B
d. A and AB
8. Mendel studied pea plants. When he crossed a true-breeding purple-flowered plant with a true- breeding white-flowered plant all of the offspring had purple flowers. What is the genotypic ratio of these F1 offspring?
a. 1:2:1
b. 2:2
c. 4:0
d. 3:1
9.Mendel studied pea plants. When he crossed a true-breeding purple-flowered plant with a true- breeding white-flowered plant all of the offspring had purple flowers. What is the phenotypic ratio of these F1 offspring?
a. 1:2:1
b. 4:0
c. 3:1
d. 2:2
10. In simple (complete) dominance, a version of a gene that is expressed only when paired with an identical allele is known as a(n)
a. Recessive allele
b. Independent allele
c. Dominant allele
d. Sex-linked allele
11. A testcross is
a. A mating between an individual of unknown genotype and an individual that is heterozygous for a trait
b. A mating between two individuals that are heterozygous for a bit
c. A mating between an individual of unknown genotype and an individual that is homozygous dominant for a trait
d. A mating between an individual of unknown genotype and an individual that is homozygous recessive for a trait
12. Dr. Smith has inherited a recessive form of deafness that is governed by simple (complete) dominance. Dr. Smith's parent have normal hearing. Which of the following alleles can Dr.Smith pass on to his offspring?
a. Dd and dd
b. D or d
c. d only
d. D only
13. Marilyn is heterozygous for type A blood. Which of the following alleles could be found in one of the eggs she produces?
a. A or O
b. O only
c. A only
d. B only
14. The genetic constitution of an organsim for a particular trait is known as one's
a. Genotype
b. Allele
c. Gene
d. Phenotype
15. Mendel crossed a pea plant that had yellow and round seeds with a pea plant that had green and wrinkled seeds. All of the offspring of cross had yellow and round seeds. This result indicated that.
a. No conclusion about dominace can be determined
b. Yellow and round are dominant traits
c. Yellow and green are co-dominant trauts
d. Green and wrinkled are dominant trait
16. Morgan studied two traits in cockroaches: body color and antennae length. brown color is dominant to red and long antennae is dominant to short. He mated a heterozygous female (BbLl) with a homozygous recessive male (bbll) and observed their 100 offspring. He hypothesized that there would be a 1:1:1:1 phenotypic ratio in the offspring. However, to his surpise, he found that only 1 of 100 offspring was red with long antennae and only 1 of 100 offspring was brown with short antennae, therefore only 2% of the offspring generation represented recombinant phenotypes. This data indicates that the two genes being studied are located
a. Very far from one another on the same chromosome
b. Only in sex chromsome
c. On separate chromosome
d. Very close to one another on the same chromosome
17. A phenotype male human has an XXY genotype. What syndrome does this human have?
a. Down Syndrome
b, Klinefelter Syndrome
c. Turner Syndrome
d. Jacob Syndrome
18. Sickle Cell Anemia is a recessive disorder governed by incomplete dominance. Inheritance of two recessive alleles leads to abnormal hemoglobin prodution. Inheritance of one recessive allele (Sickle Cell Trait) leads to abnormal hemoglobin production only under stressful conditions. A man who always produces normal hemoglobin marries a womanwho has Sickles Cell Trait. What percentage of their offspring will have sickle cell anemia?
a. 50%
b. 25%
c. 0%
d. 75%
19. Dr. Smith has inherited a recessive form of deafness that is governed by simple (complete) dominance. Dr. Smith's parents have normal hearing. Dr. Smith marries a woman who has normal hearing but whose mother is deaf. What is the chance that Dr. Smith's offspring will be deaf?
a. 100%
b. 50%
c. 25%
d. 0%
20. Fur color in mice is governed by simple (complete) dominance. White fur is recessive to brown fur. You catch a brown mouse and wonder what is its exact genotype. You mate it with your white pet mouse and all of the mice offspring are brown. What is the genotype of the brown mouse you caught?
a. Bb
b. BB
c. bb
d. B
21. Plants which are allowed to self-pollinate (self-fertillze) and produce offspring that are identical to the parents for several generations are referred to as
a. Hybrids
b. The F2 generation
c. True-breeding
d. Independent crosses
22. The physical expression of trait is known as one's
a. Genotype
b. Phenotype
c. Gene
d. Allele
23. A person has the genotype Bb. That person would be described as _____ for that trait.
a. Homozygous recessive
b. Homozygous dominant
c. Heterozyous
d. Heterozygous dominant
24. In cattle, three coat colors exist: red, white, and roan. Cattle with roan coat color (mixed red & white hairs) are the heterozygous offspring of red (RR) and white (rr) homozygotous parents. When two roan cattle are crossed, the phenotypic ratio of the offspring is 1 red: 2 roan: 1 white. Which of the following crosses would produce the highest percentage of roan cattle in the offspring?
a. Red x white
b. Red x roan
c. White x roan
d. roan x roan
25. In simple (complete) dominance, a version of a gene that is expressed even when it is paired with an allele that is different is known as a(n)
a. Recessive allele
b. Sex-linked allele
c. Independent allele
d. Dominant allele
26. Recombinant chromsome are the result of
a. Multations
b. Enviromental factor like carcinogens
c. None of the choice are correct
d. Crossing over
27. Which of the following is true of the process of meiosis?
a. Four haploid cells result
b. Two diploid cells result
c. Four diploid cells result
d. Two haploid cells result
28. A gamete is the term for human cell that contains 1 set of autosomes and one X or Y chromosome
a. True
b. False
29. You fall down during a basketball game and scrape your knee. As the patch of scraped skin heals, the cells fill in the injured but do not grow beyond that. This is example of
a. Density-independent inhibition
b. Density-dependent inhibition
c. Anchorage independence
d. Anchorage dependence inhibition
30. What indicates the begining of cytokinesis in animal cell
a. Cell plate development
b. Cleavage Furrow development
c. Kinetochore Attachment
d. Spindle develpment
31. A mass of cells that divides excessively, exhibits unusual metabolsim and impairs the function of more tha one is
a. Proto-oncogene
b. Benign tumor
c. Malignant tumor
d. Oncogene
32. Anchorage-dependence growth regulates the cell cycles because
a. Cells will normal only grow in limited layers
b. All choices correct
c. When cells are removed nearby cells will be signled to divide and fill in the gaps
d. Most human cells must be anchored to other tissue to grow
33. All of the following occur during mitosis expect
a. Formation of a spindle
b. Synthesis of DNA
c. Condensing of chromosomes
d. Disappearance of the nuclear membrance
34. A mass of abnormal cells that remains at the orginal site of development is known as a(n)
a. Benign tumor
b. proto-oncogene
c. Oncogene
d. Malignant tumor
35. A benign tumor differs from a maligant tumor in that a benign tumor
a. Is cancerous
b. Does not metastasize
c. Can only arise in the brain
d. Spreads from the orginal site
36. Which of the following is not a function of mitosis in human?
a. Growth
b. Produce sex cells
c.Repair
d. Reproduction
37. The term "Ploidy" refers to the number of complete sets of chromosomes present in a cell
a. true
b. false
38. A karyotype is a useful tool that can quickly reveal that there are too many or too few chromosomes in the cells if an individual
a. true
b false
39. DNA replication occurs prior to Meiosis I and prior to Meiosis II
a. true
b. False
40. Synapsis and tetrad formation occurs during Metaphase I of Meiosis I
a. true
b. false
41. Which of the following increase genetic variation
a. Independent assortment
b. Random fertillization of gametes
c. Crossing over
d. All choice are correct
42. Which of the following happens at the end meiosis I?
a. Sister chromatids are separated
b. The chromosome number is conserved
c. Homologous chromosomes are separated
d. Four daughter cells are formed
43. Gametes are produced by mitosis?
a. true
b. false
44. Dr. Smith has inherited a recessive form of the deafness that is governed by simple (complete) dominance. Dr. Smith's parents have normal hearing. Which of the following pairs of the genotypes could be those of Dr. Smith's parent?
a. Dd and Dd
b DD and DD
c. DD and dd
d. dd and dd
45. Gina has a child, Jeffery, Jeffery has type O blood. Which of the following could not be Gina's blood type?
a. AB
b. A
c. O
d. B
46. Mendel studied pea plants. When he crossed a true-breeding purple-flower plant with a true-breeding white-flowered plant all of the F1 offspring had purple flowera. He then crossed two of the F1 plants. What is the phenotypic ratio of the F2 offspring of this cross?
a. 4:0
b. 3:1
c: 2:2
d. 1:2:1
47. Genetic recombinants are produced by
a. Neither choice
b. All choice
c. crossing over
48. Eye color is governed by simple (complete) dominance. A homozygous recessive organism is crossed with a heterozygous organsim. What is the chance of getting an offspring with the heterozygousgenotype?
a. 0%
b. 25%
c. 100%
d. 50%
49. You make a cross between two animals: HhTt x hhtt. Which of the following are the possible genotypes for the offspring of this cross?
a. HhTt, Hhtt, hhTt and hhtt
b. HHTT and hhTT
c. HhTt only
50. A sequence of DNA that codes for a hertiable trait is a(n)
a. Allele
b. Gene
c. Phenotype
d. Genotype
51. Which of the following is not one of the Mendel's hypothesis about inheritance?
a. Alternate version of gene exist
b. For each trait, an organisam inherits two alleles (one from each parents)
c. The two alleles inherited stay together when gametes are produced
d. Dominant and recessive alleles exist
52. In some varieties of orchids, pink flowers are dominant to yellow flowers and blue seeds are dominant to orange seeds. You make a cross between an orchid with pink flowers and blue seeds and an orchid with yellow flowers with orange seeds. The F1 generation all have pink flowers and blue seeds. You cross two of these F1 hybrids. What will be the phenotypic ratio of the F2 generation?
a. 9:3:3:1
b. 1:2:1
c. 3:1
d. 4:4:4:4
53. Flagile X Syndrome is a sex-linked, recessive disorder. What is the probability that a father who has the disoder will pass on his recessive allele to his son?
a. 25%
b.100%
c. 0%
d. 50%
54. If nondisjunction occurs in meiosis II, what will be the result at the completion of meiosis?
a. two gametes will be n+1 and two will be n-1
b. two of the four gametes will be haploid (n) while the other two will be diploid (2n)
c. One gametes will be n+1, one will be n-1, two will be n
d. All the gametes will be diploid (2n)
55. Flagile X Syndrome is a sex-linked, recessive disorder. What is the probability that a mother who has the disoder will pass on her recessive allele to her son?
a. 25%
b. 50%
c. 0%
d. 100%
56. A person has the genotype bb. That person would be described as _____ for that trait.
a. Homozygous recessive
b. Homozygous dominant
c. Heterozyous
d. Heterozygous dominant
Explanation / Answer
1).
d. Tortoiseshell female, black male
Assuming that the black colour is caused by X-linked recessive allele, the female with black colour is, bXbX. The alternative allele is B, which causes orange colour. Now, the father is, BXY
As females inherit one X- from the mother and another from the father, they are heterozygous, means, tortoises shell. While the males inherit the X-chromosome from the mother, so, they are all black coloured.
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