1. A chromosome has the following segments, where * indicates the centromere: A
ID: 21972 • Letter: 1
Question
1.A chromosome has the following segments, where * indicates the centromere:
A B * C D E F G
Match the mutation type to the mutant chromosomes below.
i. tandem duplication
ii. paracentric inversion
iii. deletion
iv. displaced duplication
v. translocation
vi. pericentric inversion
___ A B A B * C D E F G
___ C * B A D E F G
___ A * C D E F G
___ A B * C D E A B F G
___ A B * C D F E G
2.
Which type of transposition involves the excision and reinsertion of the transposable element?
A) Replicative transposition
B) Retrotransposition
C) Conservative transposition
4.
Red-green color blindness is an X-linked recessive trait in humans. A young man with an XXY karyotype is color blind. His XY brother is also color blind, but both parents have normal color vision. Where and when did the nondisjunction event that gave rise to the XXY individual take place?
A) Meiosis I of the mother
B) Meiosis II of the mother
C) Meiosis I of the father
D) Meiosis II of the father
Explanation / Answer
1) iii vi ii i v iv 2) A) Replicative transposition 3) B) Meiosis II of the mother
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