A group of turtles is washed ashore on an island and no longer breeds with any turtles other than those on the island. After centuries of isolation, they no longer interbreed with the original species
This situation is best described by the term:
A. allopatric speciation.
B. migration.
C. phylogenetic speciation.
D. genetic drift.
E. natural selection.
A
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Answer the following statements true (T) or false (F)
1.The polar body formed after meiosis I becomes the egg cell. 2.Oogenesis is the formation of a diploid germ cell that divides into primary oocytes. 3.Pregnant women undergo strenuous processes during childbirth collectively known as labor. 4.Prolactin is the hormone that stimulates contractions during labor. 5.An intrauterine device (IUD) prevents pregnancy by blocking the sperms from entering into the vagina.
The bulk of the herbaceous plant's body is its __________ system
a. vascular tissue b. ground tissue c. dermal tissue d. xylem tissue e. meristematic tissue
Parenchyma and pith are cells derived from
a. meristem tissue b. ground tissue c. vascular cambium tissue d. cork cambium tissue e. epidermal tissue
When the ribosome reaches a nonsense codon, which of the following occurs?
A) a methionine is incorporated B) the polypeptide is released C) a peptide bond forms D) the A site binds to a charged tRNA