A person with Klinefelter syndrome has 44 chromosomes and three sex chromosomes (XXY). The resulting aneuploidy is caused by

a. nondisjunction.
b. crossing over.
c. a mutation.
d. an enzyme deficiency.
e. failure of DNA to replicate.


Ans: a. nondisjunction.

Biology & Microbiology

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When a cell has two complete sets of chromosomes, it is:

a. haploid b. duplicated c. diploid d. triploid e. complete

Biology & Microbiology

The pulmonary artery carries blood away from the ____

a. aorta b. right atrium c. right ventricle d. left atrium e. left ventricle

Biology & Microbiology

Genes that are duplicated within a genome and later diverge in function, such as the RNASE1 and RNASE1B genes in douc langur monkeys, are described as ________

A) duplicated genes B) orthologous genes C) homologous genes D) paralogous genes E) derived genes

Biology & Microbiology

Of the two lungs, the one on the left is usually smaller than the one on the right. This provides space for the ________

Fill in the blank(s) with correct word

Biology & Microbiology