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| 1 | |
Which of the following traits did Mendel not study during his study of inheritance? |
| | A) | Plant height |
| | B) | Pod length |
| | C) | Seed color |
| | D) | Seed texture |
| | E) | Flower position |
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| 2 | |
Which one of the following statements about an X-Y system of sex determination is correct? |
| | A) | Male somatic cells have two Y chromosomes. |
| | B) | Female somatic cells have an X chromosome and a Y chromosome. |
| | C) | This is the system of sex determination typically found in insects. |
| | D) | A gene called SRY plays an important role in the development of maleness. |
| | E) | Human somatic cells have 46 autosomes and a pair of sex chromosomes. |
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| 3 | |
True or False: Dominant alleles are fully expressed while recessive alleles are non-functional, hence the dominant phenotype of a heterozygous genotype. |
| | A) | True |
| | B) | False |
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| 4 | |
True-breeding parents are referred to as the ________ generation, and the offspring from a cross of these true-breeding parents is referred to as the ________ generation. |
| | A) | F1; F1 |
| | B) | F1; F2 |
| | C) | P; P |
| | D) | P; F1 |
| | E) | F2; F1 |
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| 5 | |
Which one of the following statements about properties and transmission of heritable traits is incorrect? |
| | A) | Inheritance is particulate and not blending. |
| | B) | Recessive traits can be seen in the F1 generation, but disappear in the F2 generation. |
| | C) | The genes for a given trait exist in two variant forms. |
| | D) | The two copies of a gene separate from each other during transmission from parent to offspring. |
| | E) | A diploid organism carries two genes for a given trait. |
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| 6 | |
Consulting Mendel's pea plant data if necessary, which of the following traits would be considered recessive? |
| | A) | Tall stems |
| | B) | Green pods |
| | C) | Round seeds |
| | D) | Purple flowers |
| | E) | Green seeds |
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| 7 | |
True or False: The measurable or detectable consequence of an organism's phenotype is called its genotype. |
| | A) | True |
| | B) | False |
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| 8 | |
In crossing a heterozygous tall male pea plant with a heterozygous tall female pea plant, what percentage of the offspring would be expected to show the dwarf phenotype? |
| | A) | 100% |
| | B) | 75% |
| | C) | 50% |
| | D) | 25% |
| | E) | 0% |
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| 9 | |
A pea plant with round seeds is crossed with a pea plant with wrinkled seeds. It is observed that half of the offspring have round seeds and half have wrinkled seeds. The most likely genotype of the parent with round seeds is ________, and the most likely genotype of the parent with wrinkled seeds is ________. |
| | A) | RR; rr |
| | B) | RR; Rr |
| | C) | Rr; rr |
| | D) | Rr; Rr |
| | E) | rr; rr |
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| 10 | |
How many boxes would there be in a Punnett square of a dihybrid cross of independently assorting genes? |
| | A) | 64 |
| | B) | 36 |
| | C) | 16 |
| | D) | 9 |
| | E) | 4 |
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| 11 | |
True or False: Mendels Law of Segregation states that homologous chromosomes segregate separately during meiosis. |
| | A) | True |
| | B) | False |
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| 12 | |
A male and a female are both heterozygous for a particular trait. According to the product rule, what is the probability that all of their four children will be homozygous for the recessive form of that trait? |
| | A) | 1/4 |
| | B) | 1/16 |
| | C) | 1/64 |
| | D) | 1/256 |
| | E) | 1 |
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| 13 | |
Which of the following statements about a recessive mode of inheritance, such as cystic fibrosis, is incorrect? |
| | A) | Unaffected individuals can produce unaffected offspring. |
| | B) | A pedigree analysis could be used to analyze the relevant trait over several generations. |
| | C) | Half of the offspring of affected individuals will also be affected. |
| | D) | Unaffected individuals can produce affected offspring. |
| | E) | All of the statements about a recessive mode of inheritance are correct. |
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| 14 | |
Which one of the following organisms would be most likely to have one haploid sex and one diploid sex? |
| | A) | Chickens |
| | B) | Bees |
| | C) | Humans |
| | D) | Grasshoppers |
| | E) | E. coli |
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| 15 | |
The term sex linked most accurately refers to |
| | A) | genes found on the X chromosome. |
| | B) | genes found on the Y chromosome. |
| | C) | genes found on one sex chromosome but not the other. |
| | D) | genes found on both sex chromosomes. |
| | E) | None of the choices accurately describes the term sex linked. |
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| 16 | |
True or False: A human male, having only one copy of the X chromosome per nucleus, would be referred to as hemizygous for the genes found only on the X chromosome. |
| | A) | True |
| | B) | False |
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| 17 | |
Two alleles that produce proteins that are equally expressed with each uniquely affecting the phenotype of a heterozygous individual is known as |
| | A) | sex-influenced inheritance. |
| | B) | codominance. |
| | C) | incomplete dominance. |
| | D) | x-linked inheritance. |
| | E) | simple Mendelian inheritance. |
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| 18 | |
Which of the following disorders follows a dominant inheritance pattern? |
| | A) | Achondroplasia |
| | B) | Phenylketonuria |
| | C) | Tay-Sachs disease |
| | D) | Cystic fibrosis |
| | E) | Hemophilia |
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| 19 | |
Which of the following apply to pleiotropy? |
| | A) | A gene may be expressed at different stages of development. |
| | B) | A gene may be expressed in different cell types. |
| | C) | A gene product may affect cell function in more ways than one. |
| | D) | A gene may be expressed at different stages of development and may be expressed in different cell types. |
| | E) | A gene may be expressed at different stages of development, a gene may be expressed in different cell types, and a gene product may affect cell function in more ways than one. |
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| 20 | |
Which of the following statements about human blood type is incorrect? |
| | A) | The gene responsible for blood type exists in more than two alleles. |
| | B) | Blood type is an example of codominance. |
| | C) | A person who is IA:i heterozygous will have type A blood. |
| | D) | Individuals with type B blood have a loss-of-function mutation in the enzyme that adds galactose to the carbohydrate tree on red blood cells. |
| | E) | All of these statements about human blood type are correct. |
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