A dihybrid testcross is made between genes H and I. Four categories of offspring are produced: H I, H i, h I, and h i. How many degrees of freedom would there be in a chi-square test for goodness of fit of the null hypothesis that the H and I genes are unlinked?
A) 1
B) 2
C) 3
D) 4
E) 0
C) 3
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Over the last several decades, what have researchers discovered about atmospheric CO2 levels?
A. They have collectively decreased. B. They have collectively increased. C. They have remained the same. D. They increased for a period, but have now stabilized.
Nematodes are unusual among worms of other major phyla by:
A. having longitudinal muscles but no circular muscles B. having separate male and female individuals C. by shedding their integument D. by having a tough cuticle made largely of collagen E. All of the choices provided are correct
If a human diploid cell and a human haploid cell somehow managed to fuse together and not lose any of the chromosomes, how many sets of chromosomes would be inside the newly formed cell?
A) 3 B) 2.5 C) 2 D) 1.5
Resource partitioning can often be seen in similar species that occupy the same geographic area. These species avoid competition by living in different portions of the habitat or by utilizing different food or other resources and are called ________ species.
A. fundamental B. allopatric C. sympatric D. exploitative E. competitive