Polygenic inheritance may result in a continuum of phenotypes because
A. the genes that are involved can be considered to be co-dominant
B. the alleles for each gene are either completely dominant or recessive.
C. there is a low environmental effect.
D. there is a high environmental effect.
A
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Which one of the following RNA types is most abundant in mammalian cells?
A. mRNA B. tRNA C. miRNA D. rRNA E. snRNA
Producers can be photosynthetic or chemosynthetic
Indicate whether the statement is true or false
Seasonal variation in solar radiation, temperature, and day length is due to the
A) tilt of the Earth's axis. B) greenhouse effect. C) Coriolis effect caused by the spinning of Earth on its axis. D) sunspot activities at the surface of the Sun.
Terrestrial vertebrate richness is most strongly tied to
A) primary productivity. B) potential evapotranspiration. C) sea surface temperatures. D) altitude.