Which of the following is an example of a postzygotic reproductive barrier
What will be an ideal response?
A.A cross between a horse and a donkey produces an infertile mule.
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The oldest fossils on Earth are more than 3 billion years old
a. True b. False Indicate whether the statement is true or false
When the gene for rat growth hormone was injected
into mouse eggs, a. they were subsequently implanted unsuccessfully into female mice. b. a third of the offspring of the surrogate mothers grew much lager than their littermates. c. the rat gene integrated into the mouse DNA, but did not express itself. d. the rat gene failed to integrate into the mouse DNA. e. all of the offspring of the surrogate mothers grew much larger than their littermates.
A centromere is least likely to ____
a. divide in anaphase of mitosis b. connect sister chromatids c. attach chromosomes to spindle fibers d. cross over during prophase I of meiosis e. be a component of DNA
Based on Acanthostega fossils, scientists now believe that the earliest tetrapods were
A) fully terrestrial. B) amphibians that used their limbs to drag themselves over the land from one water hole to another. C) fish that used their limbs to raise themselves out of the water to get gulps of air for oxygen. D) reptiles that resembled crocodiles.