Why is the incidence of survivable genetic disorders involving deletions of parts of chromosomes so rare? Why is the incidence of trisomy of larger chromosomes rarer than the incidence of trisomy of smaller chromosomes? What is the relationship between the severity of symptoms and the size of chromosome involved in the trisomy?

Why is the incidence of survivable genetic disorders involving deletions of parts of chromosomes so rare? Why is the incidence of trisomy of larger chromosomes rarer than the incidence of trisomy of smaller chromosomes? What is the relationship between the severity of symptoms and the size of chromosome involved in the trisomy?

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Description: Why is the incidence of survivable genetic disorders involving deletions of parts of chromosomes so rare?Why is the incidence of trisomy of larger chromosomes rarer than the incidence of trisomy of smaller chromosomes?What is the relationship between

Human Heredity: Principles and Issues (MindTap Course List)

11th Edition

ISBN:9781305251052

Author:Michael Cummings

Publisher:Michael Cummings

Chapter6: Cytogenetics: Karyotypes And Chromosome Aberrations

Section: Chapter Questions

Problem 22QP: Identify the type of chromosomal aberration described in each of the following cases: a. loss of a...

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Why is the incidence of survivable genetic disorders involving deletions of parts of chromosomes so rare?
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Familial Down syndrome is similar to primary Down syndrome in that it is caused by trisomy 21. However, in familial Down syndrome, all or part of the third copy of chromosome 21 has translocated onto another autosome, typically chromosome 14. In cases of familial Down syndrome, one of the parents of the affected child is often a carrier of a translocated chromosome. The translocation carrier parent does not have Down syndrome because he or she has a total of two copies of chromosome 21. Suppose that a woman is a translocation carrier of chromosome 21 on chromosome 14. She conceives six zygotes with a man who carries no aneuploidies. Match the description of the chromosomes inherited by each zygote with the viability and phenotype of the zygote. ✓ Two normal copies of 14, two normal copies of 21 two normal copies of 21, one normal copy of 14 ✓one normal copy of 14, one 21 to 14 translocation, one normal copy of 21 ✓two normal copies of 14, one normal copy of 21, on 21 to 14…
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