Quiz: Are You Ready To Take A Quick Biology Practice Quiz?
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- 1.How many unique gametes could be produced through independent assortment by an individual with the genotype AaBbCCDdEE
- A.
4
- B.
8
- C.
32
- D.
32
- 2.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?
- A.
0%
- B.
50%
- C.
25%
- D.
100%
- 3.Mendel's second law of independent assortment has its basis in which of the following events of meiosis I?
- A.
Alignment of tetrads at the equator
- B.
Synapsis of homologous chromosomes
- C.
Separation of cells at telophase
- D.
Crossing over
- 4.Given the parents AABBCc × AabbCc, assume simple dominance for each trait and independent assortment. What proportion of the progeny will be expected to phenotypically resemble the first parent?
- A.
3/4
- B.
3/8
- C.
1/8
- D.
1/4
- 5.Which of the following describes the ability of a single gene to have multiple phenotypic effects?
- A.
Incomplete dominance
- B.
Pleiotropy
- C.
Multiple alleles
- D.
Epistasis
- 6.One of two major forms of a human condition called neurofibromatosis (NF 1) is inherited as a dominant gene, although it may range from mildly to very severely expressed. If a young child is the first in her family to be diagnosed, which of the following is the best explanation?
- A.
The mother carries the gene but does not express it at all
- B.
The condition skipped a generation in the family
- C.
The child has a different allele of the gene than the parents
- D.
One of the parents has very mild expression of the gene
- 7.Marfan syndrome in humans is caused by an abnormality of the connective tissue protein fibrillin. Patients are usually very tall and thin, with long spindly fingers, curvature of the spine, sometimes weakened arterial walls, and sometimes ocular problems, such as lens dislocation. Which of the following would you conclude about Marfan syndrome from this information?
- A.
It is recessive
- B.
It is dominant
- C.
It has a late age of onset (> 60)
- D.
It is pleiotropic
- 8.What do we mean when we use the terms monohybrid cross and dihybrid cross?
- A.
A monohybrid cross involves a single parent, whereas a dihybrid cross involves two parents
- B.
A monohybrid cross produces a single progeny, whereas a dihybrid cross produces two progeny
- C.
A monohybrid cross results in a 9:3:3:1 ratio whereas a dihybrid cross gives a 3:1 ratio
- D.
A dihybrid cross involves organisms that are heterozygous for two characters and a monohybrid cross involves only one
- 9.Why did the F1 offspring of Mendel's classic pea cross always look like one of the two parental varieties?
- A.
No genes interacted to produce the parental phenotype.
- B.
Different genes interacted to produce the parental phenotype
- C.
One phenotype was completely dominant over another.
- D.
Each allele affected phenotypic expression
- 10.Why did Mendel continue some of his experiments to the F2 or F3 generation?
- A.
To observe whether or not a recessive trait would reappear
- B.
To observe whether or not the dominant trait would reappear
- C.
To distinguish which alleles were segregating
- D.
To be able to describe the frequency of recombination
- 11.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.
Tt
- B.
Hh
- C.
HhTt
- D.
HT
- 12.Mendel was able to draw his ideas of segregation and independent assortment because of the influence of which of the following?
- A.
His reading of the scientific literature current in the field
- B.
The understanding of particulate inheritance he learned from renowned scientists of his time
- C.
His discussions of heredity with his colleagues at major universities
- D.
His experiments with the breeding of plants such as peas and fuchsia
- 13.Mendel's observation of the segregation of alleles in gamete formation has its basis in which of the following phases of cell division?
- A.
Prophase I of meiosis
- B.
Anaphase of mitosis
- C.
Anaphase I of meiosis
- D.
Anaphase II of meiosis
- 14.Which of the following is an example of polygenic inheritance?
- A.
Pink flowers in snapdragons
- B.
The ABO blood group in humans
- C.
Huntington's disease in humans
- D.
Skin pigmentation in humans
- 15.Two plants are crossed, resulting in offspring with a 3:1 ratio for a particular trait. What does this suggest?
- A.
That the parents were both heterozygous for a single trait
- B.
That the parents were true-breeding for contrasting traits
- C.
That the trait shows incomplete dominance
- D.
That a blending of traits has occurred
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