The genes for ABO blood typing are IA, IB, and Ii; the superscripts indicate that _____.
A) three separate loci are associated with this trait
B) the genes are incompletely dominant
C) the genes for blood typing form a linkage group
D) the locus has multiple alleles
E) ABO blood typing results from epistatic interactions
Answer: D) the locus has multiple alleles
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Which of the following lycophytes is not properly matched to its description?
A. lycopodium: grow low to the ground, have branching stems and leaves that grow in a helical pattern B. selaginella: leaves are held in a single plane giving their branched stems a distinctive appearance; many grow as epiphytes C. quillworts (isoetes): small plants that live along the margins of lakes and streams D. tree-sized lycophytes: possess a vascular cambium; these can still be found today in tropical forests in Africa
A cell with 22 chromosomes enters meiosis, and by the end of the process has produced ________ cells with ________ chromosomes each
a. 4 / 11 b. 2 / 11 c. 2 / 22 d. 4 / 44
When retreating glaciers carved deep coastal valleys they created:
a. fjords. b. salt-wedge estuaries. c. well-mixed estuaries. d. tectonic estuaries. e. drowned river valleys.
Transovarian transmission is a process in which
A) a pathogen infects the ovaries of the host. B) a pathogen is transmitted to the host when the host ingests contaminated eggs. C) an infected female vector transmits the pathogen to the eggs forming in its ovaries. D) the pathogen is transmitted from an infected male to a healthy female during mating. E) the pathogen is spread from one host to the next by unprotected sexual intercourse.