The trophoblast secretes glycolipids to assist implantation within the endometrium

Indicate whether the statement is true or false


FALSE

Biology & Microbiology

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In 1910, Morgan did a series of experiments with the fruit fly Drosophila, an organism where females are XX and males are XY. When a mutant male fly with white eyes was crossed with a wild type female with red eyes, none of the F1 progeny had white eyes but 18% of the F2 progeny had white eyes. Unexpectedly, all of these white-eyed F2 flies were males. Based on these results, Morgan concluded that white eyes is caused by a recessive X-linked allele. Suppose Morgan had found that half of the F1 progeny had white eyes but all of these white-eyed F1 flies were females. In this case, a valid hypothesis would be  

A.  White eyes is caused by a recessive Y-linked allele. B.  White eyes is caused by a dominant Y-linked allele. C.  White eyes is caused by a dominant X-linked allele. D.  White eyes is caused by a dominant autosomal allele. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain?   Gather Content · What do you already know about X-linked inheritance?   Consider Possibilities · Consider the different answer options. Which can you rule out?   Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?

Biology & Microbiology

Many male songbirds have very distinctive songs that are used to attract females. These songs are an example of a ________ isolating mechanism.

A. postzygotic, mechanical B. postzygotic, ecological C. prezygotic, gamete fusion D. prezygotic, behavioral E. prezygotic, temporal

Biology & Microbiology

Which of the following classification methods relies on the morphology of organisms?

A) phage typing B) physical characteristics C) biochemical tests D) analysis of nucleic acids E) serological tests

Biology & Microbiology

Some protists have locomotor extensions called ________ and ________

Fill in the blank(s) with correct word

Biology & Microbiology