Which types of phenotypic ratios are likely to occur in crosses when dealing with a single gene pair for which all the genotypic combinations are of equal viability?
A) 2:3, 1:2
B) 1:4:6:4:1, 1:1:1:1
C) 9:3:3:1, 27:9:9:9:3:3:3:1
D) 12:3:1, 9:7
E) 1:2:1, 3:1
E
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The infinite variety of antibodies that can be generated by B cells is due to:
a. the infinite variety of genes in these cells b. the use of gene segments to produce an infinite variety of proteins c. the recombination of genes due to crossing over d. random mutations e. modifying the protein after an antigen is detected
If peach trees growing in specific mild climates of the southern United States do not receive about 850 hours of
temperatures below 40 degrees, they will not produce flowers in the spring. This is explained by which of the following terms?
a. photoperiodism b. phototropism c. senescence d. vernalization e. dormancy
What is the adaptive function of specialized digestive tract chambers in vegetarian animals like cows and horses?
a. maintain low pH for stomach enzymes. b. mixing of bile and pancreatic enzymes with food. c. for storage of partially digested plant material. d. housing symbiotic bacteria required for cellulose digestion. e. consolidation of undigested waste before defecation.
Immune responses triggered by ________ differences cause organ transplant rejection
a. PAMP b. pattern recognition receptor c. human leukocyte antigen d. immune-based tyrosine-activation motifs