Which best describes a gene?

O A. A tetrad

O B. A piece of a chromosome

O C. A sister chromatid

O D. A chromosome

A breeder performs a test cross to determine the genotype of a black cat. he crosses the black cat (BB or Bb) with a white cat (bb). if 50 percent of the offspring are black, what is the genotype of the black cat

In the 20th century a. Carbon dioxide emissions have begun to decline due to restrictions in the Kyoto Protocol b. The earth has warmed 10 times faster than it did coming out of the last Ice Age c.

True or false complex diseases are caused by imperfections in multiple genes

A geneticist discovers a new mutation in Drosophila melanogaster that causes the flies to shake and quiver. She calls this mutation quiver (qu) and determines that it is due to an autosomal recessive gene.

Which antibiotic does not inhibit cell wall synthesis?

What can lead to new characteristic in an organism? a. Spontaneous generation b. Mutations c. Enzymes d. Mitosis

Under certain conditions, when a mature plant or seed becomes or remains inactive, it is said to be

How does the amount of energy available change as you move from one trophic level to

Question 3 What is the asthenosphere? The tectonic plates The Earth's crust The lower mantle The molten part of the upper mantle.

What is the semi-solid food found inside the stomach during digestion called?