When Mendel crossed two plants that were heterozygous for a single trait, what was the genotypic ratio of their offspring?
A. 1:2:1
B. 9:3:3:1
C. 3:1
D. 1:1
E. Varied depending on the trait
A
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Reinforcement is most likely to drive the evolution of
A. prezygotic isolating mechanisms, because selection favors alleles that prevent hybridization. B. postzygotic isolating mechanisms, because selection acts after the formation of hybrids. C. prezygotic isolating mechanisms, because selection favors alleles that promote hybridization. D. postzygotic isolating mechanisms, because hybrids have low fitness relative to the parents.
What can be removed from pre-mRNA during alternative splicing?
a. exons and ribosomal binding sites b. ribosomal binding sites c. exons only d. introns only e. exons and introns
What are 2 functions of naturally produced chemical defenses in sponges?
What will be an ideal response?
In double fertilization, one sperm fuses with the egg, and the other sperm fuses with the two antipodal nuclei. Indicate whether the statement is true or false