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1 | |
Genes |
| | A) | Are portions of DNA that determine characteristics. |
| | B) | Are located at specific points called loci (sing.=locus). |
| | C) | May have different forms known as alleles. |
| | D) | All of the above. |
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2 | |
The set of all genes necessary to specify an organism's complete list of characteristics is known as the |
| | A) | Mendelian factor. |
| | B) | Genome. |
| | C) | Linkage group. |
| | D) | None of the above. |
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3 | |
An organism is homozygous dominant for trait "Q." Which statement is correct? |
| | A) | The genotype is QQ; the phenotype is the expression of trait Q. |
| | B) | The genotype is qq; the phenotype is the expression of trait Q. |
| | C) | The phenotype is QQ; the genotype is the expression of trait Q. |
| | D) | The phenotype is qq; the genotype is the expression of trait Q. |
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4 | |
George and his wife Sue are both heterozygous for trait "F." What are the chances that their child will express trait "F?" |
| | A) | 1 chance in 4 |
| | B) | 2 chances in 4 (or 1 in 2) |
| | C) | 3 chances in 4 |
| | D) | The child will express this trait. |
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5 | |
A red flower is crossed with a white flower and the progeny is pink. This is an example of |
| | A) | Codominance. |
| | B) | Recessive override. |
| | C) | Dominant override. |
| | D) | Carrier incompatibility. |
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6 | |
Which statement is true about X-linked genes? |
| | A) | The male needs two copies of the gene but will express the trait regardless of whether the alleles are dominant or recessive. |
| | B) | The male needs two copies of the gene but will express the trait only if both alleles are dominant. |
| | C) | The male needs only one copy of the gene and will express the trait regardless of whether the allele is dominant or recessive. |
| | D) | The male needs only one copy of the gene but will express the trait only if the allele is dominant. |
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7 | |
The SRY gene is found on the |
| | A) | Autosomes. |
| | B) | X chromosome. |
| | C) | Y chromosome. |
| | D) | Heterosome. |
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8 | |
Q:Members of one gene pair separate from each other independently of the members of other gene pairs. This is Mendel's law of |
| | A) | Segregation. |
| | B) | Independent assortment. |
| | C) | Dominance. |
| | D) | Linkage. |
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9 | |
Both Cindy and Sam are heterozygous for both freckles and white forelock, both dominant traits. What is the probability that their child will not have freckles and will not have a white forelock? |
| | A) | 1 chance in 2 |
| | B) | 1 chance in 4 |
| | C) | 1 chance in 8 |
| | D) | 1 chance in 16 |
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10 | |
Promiscuous Patsy (blood type A) has three lovers: Frank (type AB), Louis (type B), and Fred (type O). Patsy has a baby whose blood type is O. Who might be the father? |
| | A) | Either Frank or Louis |
| | B) | Either Louis or Fred |
| | C) | Either Frank or Fred |
| | D) | Either Frank or Louis or Fred |
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11 | |
Polygenic inheritance is very common in determining characteristics that are |
| | A) | Qualitative in nature. |
| | B) | Quantitative in nature. |
| | C) | Primarily hidden. |
| | D) | Not in keeping with Mendelian genetics. |
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12 | |
Pleiotropy is a term used to describe |
| | A) | Multiple effects of a single gene. |
| | B) | Genetic abnormalities. |
| | C) | The inheritance of eye color. |
| | D) | None of the above. |
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13 | |
Abraham Lincoln may have suffered from |
| | A) | PKU. |
| | B) | Cystic fibrosis. |
| | C) | Marfan syndrome. |
| | D) | Neurofibromatosis. |
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14 | |
If a dominant gene is present but not expressed in a population, this situation is referred to as |
| | A) | Variable expressivity. |
| | B) | Lack of penetrance. |
| | C) | Environmental interference. |
| | D) | Either a single- or double-factor cross, depending on the traits involved. |
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15 | |
Mitochondrial inheritance typically involves |
| | A) | Maternal mtDNA but not paternal mtDNA. |
| | B) | Paternal mtDNA but not maternal mtDNA. |
| | C) | Both maternal and paternal mtDNA. |
| | D) | Either maternal or paternal mtDNA, but not both at the same time. |
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16 | |
BbCCDd is the genotype of an organism. How many different types of gametes can this organism produce? |
| | A) | 1 |
| | B) | 2 |
| | C) | 3 |
| | D) | 4 |
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17 | |
An example of a phenotype is |
| | A) | AB type blood. |
| | B) | allele for type A and B blood. |
| | C) | a sperm with an allele for A blood. |
| | D) | lack of iron in the diet causing anemia. |
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18 | |
Body size is determined by the interaction of numerous alleles. This is an example of |
| | A) | autosomes. |
| | B) | pleiotropy. |
| | C) | single-factor crosses. |
| | D) | polygenic inheritance. |
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19 | |
The probability of guessing the correct answer to this question is |
| | A) | four . |
| | B) | one fourth. |
| | C) | sixteen. |
| | D) | 1/4 times 1/4. |
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20 | |
If both parents are heterozygous, the probability that the recessive trait will appear in the offspring is |
| | A) | 1/2. |
| | B) | 1/4. |
| | C) | 3/4. |
| | D) | zero. |
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21 | |
In order for a recessive X-linked trait to appear in a female, she must inherit a recessive allele from |
| | A) | neither parent. |
| | B) | both parents . |
| | C) | her father only. |
| | D) | her mother only. |
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22 | |
It was noticed that in certain flowers, if a flower had red petals they were usually small petals. If the petals were white, pink, or orange they were usually large petals. This could be the result of |
| | A) | lack of dominance. |
| | B) | pleiotropy. |
| | C) | linkage groups. |
| | D) | polygenic inheritance. |
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23 | |
In pea plants, tall plant height (T) dominates dwarf (t). If a plant heterozygous for the height trait is crossed with a dwarf plant, what will be the phenotypic ratios of the offspring? |
| | A) | all Tt |
| | B) | 1/2 Tt, 1/4TT, 1/4tt |
| | C) | 1/2 tall, 1/2 dwarf |
| | D) | 3/4 tall, 1/4 dwarf |
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24 | |
A man with normal color vision marries a woman with normal vision, but who is a carrier for color blindness. The probability that their first child will be color blind is ________ ; the probability that their first daughter will be color blind is ________; and the probability that their first son will be color blind is ________. |
| | A) | 1/2; 1/2; 1/2 |
| | B) | 1/4; 0; 1/2 |
| | C) | 1/2; 0; 1/2 |
| | D) | 1/4; 1/2; 1/2 |
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25 | |
A woman with blood type O and a man with blood type AB have a child together. What are the possible bloodtypes of this child? |
| | A) | AB or O |
| | B) | A, B, or O |
| | C) | A or B |
| | D) | AB, A, B, or O |
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26 | |
A radish plant that produces round radishes is crossed with a radish plant that produces long radishes. All of the offspring have oval radishes. Radish shape may be inherited by |
| | A) | polygenic inheritance. |
| | B) | pleiotropy. |
| | C) | multiple alleles. |
| | D) | lack of dominance. |
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27 | |
In the following cross, what is the probability that the offspring will exhibit both dominant traits? Aabb X aaBB |
| | A) | 1/2 |
| | B) | 3/8 |
| | C) | 4/16 |
| | D) | 1 |
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28 | |
She has really long fingers and toes and is exceptionally tall. This is a statement of |
| | A) | genotype. |
| | B) | phenotype. |
| | C) | monohybridization. |
| | D) | locus placement. |
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