Which one of the following insect organ systems has placed the greatest limitation on their body size?
A. excretory system
B. nervous system
C. digestive system
D. reproductive system
E. respiratory system
Answer: E
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If one parent is heterozygous for a dominant allele on an autosome and the other parent does not carry the dominant allele, any child of theirs has a _____ chance of being heterozygous
a. 25 percent b. 50 percent c. 75 percent d. no chance; it will die
The key gene in mammalian sex determination is
A) the testis-determining factor gene. B) the Y-factor gene. C) the holandric factor gene. D) the X-inactivation center. E) the lyonization gene.
As early as the ________ month, as the brain and spinal cord grow, the fetus can demonstrate movement and respond to stimuli
A) fourth B) third C) second D) sixth E) fifth
Why can some plants be cloned from a single cell?
A) Plant cells do not differentiate even when mature, so any cell can grow into an entire plant. B) Plant cells can dedifferentiate and give rise to all of the specialized cells required to produce an entire plant. C) Plant cells can produce genes to replace those lost during development. D) Plant cells are capable of self-renewal by utilizing cellular components from adjacent cells.