Drosophila melanogaster (D. melanogaster) is a species of fruit fly frequently used by researchers in genetic studies. Members of this species have two of each of four different chromosomes: the sex chromosome (fies have X and Y) and three autosomes (chromosomes 2, 3, and 4). Researchers studying D. melanogaster conducted genetic crosses to investigate a particular X-linked recessive trait encoded by a single gene (Table 1). Affected flies have the trait. TABLE 1. CROSSES PERFORMED AND THE PHENOTYPES OF THE RESULTING OFFSPRING Phenotype of Females Phenotype of Males Percent of Total Population Percent of Male Offspring Percent of Female Offspring Cross Number Used in the Cross Used in the Cross That Are Affected That Are Affected That Are Affected Unaffected Affected 2. Affected Unaffected 50 100 3. Unaffected Unaffected 25 50 4. Affected Affected 100 100 100
Drosophila melanogaster (D. melanogaster) is a species of fruit fly frequently used by researchers in genetic studies. Members of this species have two of each of four different chromosomes: the sex chromosome (fies have X and Y) and three autosomes (chromosomes 2, 3, and 4). Researchers studying D. melanogaster conducted genetic crosses to investigate a particular X-linked recessive trait encoded by a single gene (Table 1). Affected flies have the trait. TABLE 1. CROSSES PERFORMED AND THE PHENOTYPES OF THE RESULTING OFFSPRING Phenotype of Females Phenotype of Males Percent of Total Population Percent of Male Offspring Percent of Female Offspring Cross Number Used in the Cross Used in the Cross That Are Affected That Are Affected That Are Affected Unaffected Affected 2. Affected Unaffected 50 100 3. Unaffected Unaffected 25 50 4. Affected Affected 100 100 100
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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A. Identify the genotypes of the male and female used in cross 2.
B. Identify the cross in which the female parent was most likely heterozygous.
C. Explain how the results exclude the possibility that the trait is encoded by a mitochondrial gene.
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