In 1997, a gene called Le was discovered by two research groups led by David Martin and Diane Lester. Allelic variation in the Le gene, which controls elongation of the plant stem between branches, is responsible for which trait in peas?
A) inflated and constricted pod shape
B) yellow and green pod color
C) purple and white flowers
D) tall and short plant height
E) axial and terminal flower position
D
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In addition to burning fossil fuels, humans return CO2 to the atmosphere faster than it can be removed by:
A. clearing forests for agriculture. B. polluting the oceans. C. generating nutrient pollution. D. expanding rice production. E. expanding beef production.
A silent mutation is a change in the DNA sequence that alters the amino acid sequence of the encoded protein but does not change its function
Indicate whether the statement is true or false
In some butterfly populations, there are equal frequencies of alleles that code for black and yellow coloration. This is an example of
A) stabilizing selection. B) sexual selection. C) nonrandom mutations. D) directional selection. E) balanced polymorphism.
What is a point mutation?
A) a mutation that affects only one metabolic pathway B) a mutation found at a single base pair in the genome C) a mutation that affects a single cell D) a mutation in which one chromosome is lost E) an error in DNA that is caused by malfunctioning of DNA ligase