When both alleles for a particular trait are expressed at the same time, we see an example of
a. incomplete dominance.
b. simple dominance.
c. recessivity.
d. codominance.
e. corecessivity.
D
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Sensory pathways of smell and taste
a. begin with chemoreceptors b. end up in the cerebral cortex. c. reach the limbic system. d. are integrated with stored memories. e. include all of these.
Extinction is a natural phenomenon. It is estimated that 99% of all species that ever lived are now extinct. Why then do we say that we are now experiencing an extinction (loss of biodiversity) crisis?
A) Humans are ethically responsible for protecting endangered species. B) Scientists have finally identified most of the species on Earth and are thus able to quantify the number of species becoming extinct. C) The current rate of extinction is high and human activities threaten biodiversity at all levels. D) Humans have greater medical needs than at any other time in history, and many potential medicinal compounds are being lost as plant species become extinct. E) Most biodiversity hot spots have been destroyed by recent ecological disasters.
Which organisms form the basic foundation of the food chain in the ocean?
A) phytoplankton B) jellyfish C) krill D) shrimp
Think of the last egg you ate. It came from a hen that hatched from an egg itself. Describe the process that needed to occur from the hen’s egg to the egg you ate. Think about processes in the hen and also in the hatchery.
What will be an ideal response?