DNA methylation of a gene during spermatogenesis would result in
A. the inactivation of the paternal allele in the offspring.
B. dosage compensation by the paternal allele.
C. the inactivation of the maternal allele in the offspring.
D. the inactivation of the X chromosome.
E. dosage compensation by the maternal allele.
A. the inactivation of the paternal allele in the offspring.
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Due to the lack of an enzyme to break down lipids, excess accumulation of lipids in the brain leads to a human disease called Tay-Sachs syndrome. The organelle(s) most likely to lack the proper enzyme needed for lipid breakdown is/are
A. lysosomes. B. tonoplasts. C. mitochondrion. D. Golgi apparatus. E. peroxisomes.
A(n) ____ provides nutrients in germinating seedlings of eudicots
a. suspensor b. epicotyl c. hypocotyl d. endosperm e. cotyledon
The upper, unconfined portion of the groundwater constitutes the ____, which flows into streams and is partly accessible to plants.
A. aquifer B. hydrozone C. water table D. watershed
Which provides the most direct evidence for evolution?
a. biogeography b. the fossil record c. molecular biology d. convergent evolution e. comparative anatomy