A sterile mule is produced by mating a horse and a donkey. From this observation you could conclude
A. that horses and donkeys are the same species.
B. that horses and donkeys are different species.
C. that mules are a result of macroevolution.
D. increasing the number of mules in a population will affect the allele frequency in the next generation.
E. the DNA sequences of horses and donkeys are more than 97% identical.
B. that horses and donkeys are different species.
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The genotype of a particular pea plant is TtYy, corresponding to a phenotype of tall and yellow. How many different types of gametes are expected to be produced by this individual?
A) 1 B) 2 C) 4 D) 5 E) 8
How do monotremes differ from other mammals? Check all that apply.
_____ Monotremes lay eggs. _____ Monotremes are found only in New Guinea and Australia. _____ Monotremes lack a placenta. _____ Monotremes have poorly developed nipples. _____ Monotremes are cold-blooded.
A 3.6 million-year-old partial skeleton, named Lucy, represents an individual who was a member of
A) Australopithecus afarensis. B) Homo erectus. C) Homo habilis. D) Australopithecus garhi.
Which of the following is a neurotransmitter that triggers a contraction of a voluntary muscle?
A) acetylcholine B) action potential C) synapse D) sodium