If you mate a donkey (2n = 62) with a horse (2n = 64) you get a mule. A mule is sterile and cannot produce gametes by meiosis because
A. they contain too few chromosomes.
B. they have an odd number of chromosomes.
C. they have an even number of chromosomes.
D. they contain too many chromosomes.
E. they lack genes that are essential for life.
B. they have an odd number of chromosomes.
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A pyrimidine or purine base that has been joined with a ribose or deoxyribose sugar moiety is now termed a ________.
Fill in the blank(s) with the appropriate word(s).
Macroscopic fossils of organisms thought to be animals first appeared in rocks deposited around _____ million years ago
A. 575 B. 542 C. 420 D. 360 E. 100
Which of the following is not believed to be a virus or to be caused by a virus?
A) TMV B) AIDS C) Epstein-Barr D) scrapie E) T4 phage
The male sage grouse who is “displaying” is likely _____
a. indicating that he are ready to spar with other males b. claiming part of the territory as his own c. attracting a mate in a monogamous union d. attracting a mate in a polygamous union e. indicating that he has won a mate