Which of the following did Mendel confirm with reciprocal crosses that generated an identical F 1 and F 2 offspring ratio of 3:1?
a. Traits are inherited independently.
b. Dominant and recessive traits are blended.
c. Recessive traits disappear at every cross.
d. First-generation crosses produce hybrids.
a. Traits are inherited independently.
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The wing of a bat, the flipper of a whale, and the arm of a human have a similar structure and all can trace their lineage back to a common ancestor. This would be an example of which of the following?
a. a homologous structure b. a vestigial structure c. an analogous structure d. none of the above
Dinoflagellates became photosynthetic via secondary endosymbiosis
Indicate whether the statement is true or false.
Which of the following first appears in a third trimester human fetus?
a. lanugo hair b. open eyes c. facial expressions d. sucking movements e. heart beats
Elephants are killed for their tusks and rhinos for their horns. This is an example of __________ for traditional medicine and ornaments.
Fill in the blank(s) with the appropriate word(s).