The earth has gone through a series of mass extinctions caused by a variety of different factors. The current mass extinction is believed to be the result of:
a) global warming.
b) loss of the ozone layer.
c) reduced levels of speciation.
d) normal fluctuations in species diversity.
e) human activities.
Ans: e) human activities.
You might also like to view...
Which gene sequence elements are present in prokaryotes?
a. codons b. capping signals c. poly(A) signals d. sorting signals on proteins
The dominant phenotype can be produced by which of the following?
a) Rr only b) Both RR and Rr c) RR only d) Both Rr and rr e) rr only
Assume that a dihybrid cross is made in which the genes' loci are autosomal, independently assorting, and incompletely dominant. How many different phenotypes are expected in the offspring?
A) 9 B) 4 C) 6 D) 12 E) 2
A strategy to induce random indels in a target sequence might use ________
A) NHEJ to ligate fragments B) HDR and a donor template C) NHEJ and Cas9 D) HDR to match damaged and undamaged chromosomes