Thyroid hormone's main effect is on:
a. calcium levels
b. iron levels
c. metabolism and development
d. sexual reproduction
e. water reabsorption
c
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Which type of selection is occurring with the ?-globin gene?
The human ?-globin gene has two alleles, HS and HA, individuals that are homozygous for HS have sickle-cell anemia and a lower fitness. Individuals that are heterozygotes (HSHA) do not show sickle-cell symptoms and have a resistance to malaria. Individuals that are homozygous for HA have the highest fitness but are susceptible to malaria. In areas where malaria is prevalent the HS allele is maintained in the population. A. stabilizing B. directional C. disruptive D. balanced E. negative
Environmental effects can result in
a. altered metabolic pathways. b. a gene mutating in different ways in different individuals. c. altered genotypes. d. a post-developmental environmental effect. e. altered phenotypes.
A term often used to describe an organism that is a genetic mosaic, resulting from the introduction of DNA from another organism, is ________
Fill in the blank(s) with correct word
Organelles found in algae but not found in protozoa or fungi are the
A) Chloroplasts B) Golgi apparatus C) Endoplasmic reticulum D) Mitochondria E) Lysosomes