A male Drosophila from a wild-type stock is discovered to have only 7 chromosomes, whereas normally 2n = 8. Close examination reveals that one member of chromosome IV (the smallest chromosome) is attached to (translocated to) the distal end of chromosome II and is missing its centromere, thus accounting for the reduction in chromosome number. (a) Diagram all members of chromosomes II and IV in the male fly during synapsis in meiosis I. b) If this male mates with a female with normal chromosomes composition, what chromosomes compositions will occur in their progeny? Describe the type of chromosomal aberration that may occur in their progeny and indicate chromosome number for each progeny produced.
A male Drosophila from a wild-type stock is discovered to have only 7 chromosomes, whereas normally 2n = 8. Close examination reveals that one member of chromosome IV (the smallest chromosome) is attached to (translocated to) the distal end of chromosome II and is missing its centromere, thus accounting for the reduction in chromosome number. (a) Diagram all members of chromosomes II and IV in the male fly during synapsis in meiosis I. b) If this male mates with a female with normal chromosomes composition, what chromosomes compositions will occur in their progeny? Describe the type of chromosomal aberration that may occur in their progeny and indicate chromosome number for each progeny produced.
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
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Transcribed Image Text:A male Drosophila from a wild-type stock is discovered to have only 7 chromosomes, whereas
normally 2n = 8. Close examination reveals that one member of chromosome IV (the smallest
chromosome) is attached to (translocated to) the distal end of chromosome II and is missing its
centromere, thus accounting for the reduction in chromosome number. (a) Diagram all members of
chromosomes II and IV in the male fly during synapsis in meiosis I. b) If this male mates with a female
with normal chromosomes composition, what chromosomes compositions will occur in their progeny?
Describe the type of chromosomal aberration that may occur in their progeny and indicate
chromosome number for each progeny produced.
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