Which of the following structures is NOT
found in mature sperm?
a. nucleus
b. acrosome with enzymes
c. mitochondria
d. microtubules in the tail
e. ribosomes
E
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The human b-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. Which type of selection is occurring with the b-globin gene?
A. stabilizing B. directional C. disruptive D. balanced E. negative frequency dependent
Birds are evolved from reptiles, but also differ dramatically. Which features of birds differentiate them from most reptiles?
What will be an ideal response?
“Tardigrada” means
a. tough exoskeleton. b. many proglottids. c. slow walker. d. short digestive system. e. coelom.
How many codons do not code for any amino acid?
A. 0 D. 3 B. 1 E. 4 C. 2