Fossil evidence places the origin of angiosperms in the Jurassic period, at least 144 million years ago. The major lineages of angiosperms today were in place approximately 100 million years ago. Now, angiosperms make up 95% of all modern plant species. What relationship between angiosperms and animals may have aided the rapid diversification of flowering plants?
A. Animals eating the plants helped to disperse both pollen and seeds.
B. Competition with animals helped spread pollen and seeds.
C. Animals died off, allowing more plants to survive.
D. Animals became carnivores, allowing plants to survive.
E. Coevolution with animals helped spread pollen and seeds.
E. Coevolution with animals helped spread pollen and seeds.
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Sperm are produced in the
a. testes. b. vas deferens. c. epididymis. d. prostate gland. e. penis.
In positional cloning, the inheritance of a disease in a pedigree was linked to the inheritance of
A. other diseases or conditions. B. a specific blood type. C. other genes whose loci were known. D. marker sequences produced by restriction enzymes. E. all of these.
How would you best explain the correlation between an increase in Hox genes and an increase in animal body complexity?
A. Different Hox genes are expressed in different regions of the body. B. An increase in the number of Hox genes meant that fewer regulatory genes could be controlled in a species. C. As the number of Hox genes increases, the number of genes encoding proteins for appendage development decreases D. Hox genes have duplicated several times during animal evolution, but they are not responsible for an increase in body plan complexity. E. An increase in the number of Hox genes allows for greater specialization in different body regions.
What is the site of nitrogen fixation in legumes?
a. mycorrhizae b. root nodules c. phloem d. the cortex e. the pith