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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.

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.

Human Anatomy & Physiology (11th Edition)
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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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. B. The allele that causes achondroplasia is a dominant lethal allele. C. Achondroplasia is incompletely dominant to the normal condition. D. The allele that causes achondroplasia is a recessive lethal allele. E. The allele that causes achondroplasia is a late-onset lethal allele.
Transcribed Image Text: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. B. The allele that causes achondroplasia is a dominant lethal allele. C. Achondroplasia is incompletely dominant to the normal condition. D. The allele that causes achondroplasia is a recessive lethal allele. E. The allele that causes achondroplasia is a late-onset lethal allele.
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