Please answer all multiple choice 14. Generally, only one sperm fertilizes an eg
ID: 194566 • Letter: P
Question
Please answer all multiple choice 14. Generally, only one sperm fertilizes an egg because there are so few sperm that two are unlikely to arrive at the same time. B. sperm compete and only the most fit one is accepted. C, many sperm enter but only one set of chromosomes fuses with the egg nucleus; excess sperm are absorbed. g membrane, it separates the fertilization membrane and when the first sperm membrane fuses with the eg forms a barrier to other sperm 15. A blastula develops into which state as the gut cavity develops? A. It remains in the blastula stage. gastrula C. acoelomate D. pseudocoelomate 16. Which pair of the following taxa are likely to be most closely related to each other: Bufo americanus, Turdus americanus, Bufo mexicana, Rana mexicana ? a) there is no way to know b) Turdus americanus and Bufo americanus Turdus americanus and Rana Mexicana d) Bufo americanus and Bufo mexicana e) Bufo mexicana and Rana mexicana 7 character states are present in the common ancestor and all members of a group. 1 ?- A. Ancestral B. Analogous C Derived D Synapomorphous 18. A taxon is paraphyletic if it Aincludes the B. includes the most recent common ancestor of all members of the group and descendants most recent common ancestor of all members of the group and all of its descendants. some, but not all, of its s not include the most recent common ancestor of all members of the group. D. excludes the most recent common ancestor of all members of the group 19. An entomologist discovered that two morphologically identical crickets sang completely different mating songs and this resulted in the two populations never mating. Thus they were A. sister groups sibling species. C. paraphyletic. D. polyphyletic. 20 The theory of evolution, along with all other theories in science A has been proven in a mathematical sense. B. is mere speculation. Cjs testable, tentative, and potentially falsifiable. is so powerful that no conceivable evidence could possibly refute it.Explanation / Answer
14. D is correct. This happens to prevent polyspermy. If more than one sperm were to fertilize the egg then the contribution by one kind of parent will increase and 1:1 ratio of genes from each parent would be disrupted.
15. Gastrula is correct. When the cells move and become differentiated into 3 germ layers, a cavity develops called archenteron.
16. D is correct .they belong tot he same genus but the species are different and thus are more closely related than any other pair that can be formed.
17. D is correc. A synopomorohic character is present in both the ancestors and it's descendants.
18. B. A paraphyletic group contains the ancestor and it's descendants but not all its descendants are included
19. Sibling species is correct. They produce infertile hybrids.
20. C is correct.
Related Questions
drjack9650@gmail.com
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.