How many chromosomes do humans with down syndrome have?

What is a limitation of using pedigrees for positional cloning?

The lion's scientific name is Panthera leo. The leopard's scientific name is Panthera pardus. The tiger's is Panthera tigris. Which statement is true? A) All 3 animals share a genus. B) All 3 animals share a species.

In squirrels, the gene for gray fur (G) is dominant over the gene for black fur (g). If 50% of a large litter of squirrels are gray, the parental cross that produced this litter was most likely

How do the cells of the xylem compare to the cells of the phloem?

Why is coral found near the surface of the water?

The insertion of the human insulin gene into the bacterium Escherichia coli allowed it to produce human insulin. Which type of organism is E. coli?

When do introduced species become invasive?

If arthropods' appendages were not jointed, how would that affect them?

A student decides to set up an experiment to see if detergent affects the growth of seeds. he sets up 10 seed pots. 5 of the seed pots will receive a small amount of detergent in the soil and will be placed in the sun.

When a liquid or gas is no longer heated, the convection currents what?