______________ are defined as haploid (1n) cells that can form gametophytes. Gametophytes, in turn, produce either haploid (1n) male or female _____________ that can fuse to form diploid (2n) ____________
A. Spores; gametes; zygotes
B. Gametes; spores; zygotes
C. Zygotes; spores; gametes
D. Spores; zygotes; gametes
E. Gametes; zygotes; spores
A
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In negative control, a gene is switched off when _____
A) a kinase adds a phosphate to DNA B) lactose is transported into the cell C) a regulatory protein binds to DNA and shuts down transcription D) a regulatory protein is removed from DNA and shuts down transcription
An oligonucleotide is defined as a:
A. short, double-stranded DNA molecule of known sequence. B. short, single-stranded DNA molecule of known sequence. C. long, single-stranded DNA molecule of unknown sequence. D. short, single-stranded RNA molecule of known sequence. E. long, double-stranded RNA molecule of unknown sequence.
The effect of resource availability on population size ultimately determines ____.
A. the carrying capacity of the environment B. exponential growth C. the doubling time of a population D. the population’s biotic potential E. the loss of species in an ecosystem
Looking at the figure above, draw the three rooted trees that would result from rooting a tree at each of the nodes A, B, and C indicated by the labeled dots
What will be an ideal response?