Achondroplasia is a common cause of dwarfism in humans. All individuals with achondroplasia are thought to be heterozygous at the locus that controls this trait. When two individuals with achondroplasia mate, the offspring occur in a ratio of 2 achondroplasia : 1 normal. What is the MOST likely explanation for these observations? O A. Achondroplasia is codominant to the normal condition. O B. The allele that causes achondroplasia is a dominant lethal allele. O C. Achondroplasia is incompletely dominant to the normal condition. O D. The allele that causes achondroplasia is a recessive lethal allele. O E. The allele that causes achondroplasia is a late-onset lethal allele.

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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.