Each spore grows by mitosis into a haploid organism by called a ________
Fill in the blank(s) with the appropriate word(s).
Answer: gametophyte
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True or false? _____ Mutations always result in negative effects on the organism. _____ Mutations are always large-scale (e.g., involving at least 10,000 base pairs of DNA)
DNA). _____ Mutations are never large-scale (e.g., involving at least 10,000 base pairs of DNA). _____ Most mutations are caused by an environmental pollutant. _____ Mutation rates are constant in all organisms. _____ Mutation rates are higher in men than in women because men have higher metabolic rates than women. _____ Mutation occurs every time a cell divides. _____ All mutations provide genetic variation on which evolution may act. What will be an ideal response?
The pharyngeal arches give rise to the ____
a. spinal cord b. neck c. brain d. heart e. backbone
A molecule consists of ____
a. radioactive compounds b. two or more atoms of the same element c. electrically charged elements d. elements with one or more extra neutrons e. atoms held together by chemical bonds
Which ancestors of modern humans migrated out of Africa to populate the rest of the world?
a. Homo habilis b. Homo erectus c. Neanderthals d. Cro Magnon e. Homo sapiens