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Changes in Chromosome Structure and Number 20. Six bands in a salivary gland chromosome of drosophila are shown here along with the extent of five deletions (Del 1 to Del 5):³ -------1------2-----3-----4----------5----------6---- Del 1 Del 2 Del 3 Del 4 Del 5 Recessive alleles a, b, c, d, e, and fare known to be in this region, but their order is unknown. When wild-type individuals with the deletions are testcrossed to individuals recessive for all six genes, the following results are obtained (a minus sign indicates the wild-type allele is masking the expression of the recessive mutant allele, a plus sign indicates the recessive allele is being expressed). Use these data to infer which salivary band corresponds to each gene. b с a + Del 1 Del 2 + Del 3 + Del 4 Del 5 + ' I ++++ 1 d ++ + e +++ +

Changes in Chromosome Structure and Number 20. Six bands in a salivary gland chromosome of drosophila are shown here along with the extent of five deletions (Del 1 to Del 5):³ -------1------2-----3-----4----------5----------6---- Del 1 Del 2 Del 3 Del 4 Del 5 Recessive alleles a, b, c, d, e, and fare known to be in this region, but their order is unknown. When wild-type individuals with the deletions are testcrossed to individuals recessive for all six genes, the following results are obtained (a minus sign indicates the wild-type allele is masking the expression of the recessive mutant allele, a plus sign indicates the recessive allele is being expressed). Use these data to infer which salivary band corresponds to each gene. b с a + Del 1 Del 2 + Del 3 + Del 4 Del 5 + ' I ++++ 1 d ++ + e +++ +

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
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**Changes in Chromosome Structure and Number** **20.** Six bands in a salivary gland chromosome of Drosophila are shown here along with the extent of five deletions (Del 1 to Del 5): ``` ------1-------2-------3-------4-------5-------6------ Del 1 ======================================== Del 2 =========================== Del 3 ================== Del 4 =========== Del 5 ======= ``` Recessive alleles \( a, b, c, d, e, \) and \( f \) are known to be in this region, but their order is unknown. When wild-type individuals with the deletions are testcrossed to individuals recessive for all six genes, the following results are obtained (a minus sign indicates the wild-type allele is masking the expression of the recessive mutant allele, a plus sign indicates the recessive allele is being expressed). Use these data to infer which salivary band corresponds to each gene. | | a | b | c | d | e | f | |-------|-----|-----|-----|-----|-----|-----| | Del 1 | + | + | - | + | + | + | | Del 2 | + | + | - | + | - | - | | Del 3 | - | - | - | + | - | - | | Del 4 | - | - | - | - | - | - | | Del 5 | - | - | - | - | - | + | This table indicates which alleles are expressed under each deletion, helping to determine the location of each gene along the chromosome.
Transcribed Image Text:**Changes in Chromosome Structure and Number** **20.** Six bands in a salivary gland chromosome of Drosophila are shown here along with the extent of five deletions (Del 1 to Del 5): ``` ------1-------2-------3-------4-------5-------6------ Del 1 ======================================== Del 2 =========================== Del 3 ================== Del 4 =========== Del 5 ======= ``` Recessive alleles \( a, b, c, d, e, \) and \( f \) are known to be in this region, but their order is unknown. When wild-type individuals with the deletions are testcrossed to individuals recessive for all six genes, the following results are obtained (a minus sign indicates the wild-type allele is masking the expression of the recessive mutant allele, a plus sign indicates the recessive allele is being expressed). Use these data to infer which salivary band corresponds to each gene. | | a | b | c | d | e | f | |-------|-----|-----|-----|-----|-----|-----| | Del 1 | + | + | - | + | + | + | | Del 2 | + | + | - | + | - | - | | Del 3 | - | - | - | + | - | - | | Del 4 | - | - | - | - | - | - | | Del 5 | - | - | - | - | - | + | This table indicates which alleles are expressed under each deletion, helping to determine the location of each gene along the chromosome.
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