Suppose that, at the time a human zygote is undergoing cleavage, the first two plastomeres that form separate from each other completely. Both of the plastomeres and their cellular descendants continue to divide on schedule, on the prescribed developmental program. The result is identical twins or two normal, genetically individuals. By contrast, non-identical twins form when two different secondary oocytes are fertilized at the same time by two different sperm. Based on this information, explain why non-identical (fraternal) twins show considerable genetic variability and identical twins do not.
Suppose that, at the time a human zygote is undergoing cleavage, the first two plastomeres that form separate from each other completely. Both of the plastomeres and their cellular descendants continue to divide on schedule, on the prescribed developmental program. The result is identical twins or two normal, genetically individuals. By contrast, non-identical twins form when two different secondary oocytes are fertilized at the same time by two different sperm. Based on this information, explain why non-identical (fraternal) twins show considerable genetic variability and identical twins do not.
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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Transcribed Image Text:Suppose that, at the time a human zygote is undergoing cleavage, the first two
blastomeres that form separate from each other completely. Both of the
blastomeres and their cellular descendants continue to divide on schedule, on the
prescribed developmental program. The result is identical twins or two normal,
genetically individuals. By contrast, non-identical twins form when two different
secondary oocytes are fertilized at the same time by two different sperm.
Based on this information, explain why non-identical (fraternal) twins show
considerable genetic variability and identical twins do not.
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