Which of the following statements is TRUE?
A) Individuals with familial Down syndrome are trisomic and have 47 chromosomes.
B) Familial Down syndrome is caused by a translocation involving chromosome 21.
C) Translocations may be pericentric or paracentric.
D) In general, inversion and translocation heterozygotes are as fertile as organisms whose chromosomes are in the standard arrangement.
E) Inversions and translocations are without evolutionary significance.
Answer: B
You might also like to view...
An RNA processing event that frequently leads to different protein productsencoded by a single gene is:
A. transcription. B. alternative splicing. C. alternative transcription. D. polyadenylation.
The two basic structural forms taken by most viruses are ____
a. polyhedral or enveloped b. helical or enveloped c. helical or polyhedral d. cylindrical or polyhedral e. cylindrical or enveloped
The definition of allopolyploidy is
a. a genetic divergence that results in nonviable offspring. b. a decrease in chromosome number due to hybridization of different species. c. a decrease in chromosome number within a single species. d. an increase in chromosome number due to hybridization of different species. e. an increase in chromosome number within a single species.
Could two phenotypically normal parents have a child with cystic fibrosis?
a. Yes b. No