Which of the following is NOT a reason that a testcross is a useful technique when studying the inheritance of a trait? Select one: a. The relative frequencies of the different phenotypes among the testcross progeny can be used to map linked genes. b. A testcross can determine if an individual with the dominant phenotype is homozygous or heterozygous. c. The gametes produced by the testcross parent are determined from the testcross progeny. d. Because the testcross parent can contribute only recessive alleles, the alleles contributed by the other parent will be expressed in the offspring of the testcross.

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A:

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Inheritance and Mendelian Genetics

Inheritance means the passing of traits to offspring from parents. These traits could be passed either through asexual reproduction or sexual reproduction. The offspring receives the genetic material from the parents. Mendelian inheritance is a certain biological inheritance that follows the rules and principles laid down by Gregor Mendel in 1865. The initial hypothesis was considered wrong, but other inheritance theories modified the concept of inheritance and thus genetics.