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Free CLEP Science and Mathematics Exam Braindumps (page: 19)

Page 18 of 128
PDF with 494 Questions

A second set of alleles determines whether or not a first set of alleles will be expressed.

  1. Epistasis
  2. Epigenesis
  3. Genomic imprinting
  4. Triplet repeat extension
  5. Mitochondrial inheritance

Answer(s): A

Explanation:

In some cases, a second set of genes determines whether or not a first set of genes will be expressed. For example, there may be genes for black fur (B) and brown (b) that are expressed only if a dominant gene for coloration (C) is present somewhere else. So, and individual could be BbCc and express black fur, or be Bbcc and be albino because of the recessive "no color" genes (c). This is known as epistasis.



Genes passed down through the egg from mother to offspring, and never passed down from fathers to offspring.

  1. Epistasis
  2. Epigenesis
  3. Genomic imprinting
  4. Triplet repeat extension
  5. Mitochondrial inheritance

Answer(s): E

Explanation:

Since eggs contain all organelles and sperm contain no organelles, the organelles of offspring are maternally derived. Not only that, but since mitochondria have their own DNA, distinct from nuclear DNA, diseases or other traits can be passed through maternal lines via mitochondria. They would be passed to all children from a mother, but only female children would continue to pass the trait on.



A genetic inheritance pattern that results from the fact that certain alleles seem to be coded differently according to which parent that come from.

  1. Epistasis
  2. Epigenesis
  3. Genomic imprinting
  4. Triplet repeat extension
  5. Mitochondrial inheritance

Answer(s): C

Explanation:

Genomic imprinting is the situation in which certain alleles seem to be methylated in different patterns depending upon which parent they come from. Thus, an allele for a certain trait coming from the father's sperm may not be expressed in the offspring at all, even though the identical allele from the mother's egg would be expressed.



The driest of all biomes, with little rain and limited vegetation.

  1. Taiga
  2. Temperate deciduous forest
  3. Tundra
  4. Chaparral
  5. Desert

Answer(s): E

Explanation:

The driest of all biomes is the desert.






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