The lethality of most monosomies and trisomies in humans shows:
A. the importance of gene dosage.
B. the deleterious effects of variable number
tandem repeat sequences.
C. the advantage of sexual reproduction.
D. the rarity of gene copy number variation in
the genome.
A
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Which category in the figure above makes available the highest productivity per square meter?
A) tropical wet forest B) open ocean C) algal beds and reefs D) wetlands
Who first described cells?
A. Linnaeus B. Golgi C. Darwin D. Leeuwenhoek E. Hooke
Binding of _____ to _____ in DNA can increase the rate of transcription of specific genes
a. activators; promoters b. activators; enhancers c. repressors; operators d. both activators; promoters and activators; enhancers
An x-shaped appearance of chromosomes during the process of meiosis provides evidence of
a. irradiation damage. b. crossing over. c. chromosomal aberration. d. fertilization. e. spindle fiber formation.