What Is a Testcross

question 37

Multiple Choice

What is a testcross?

• A)Any genetics cross you do in order to test a hypothesis.
• B)Any genetics cross you see on an exam
• C)A cross between two organisms of different species
• D)A cross between an organism of unknown genotype with a homozygous recessive individual
• E)A cross between two true-breeding individual (such as we see in the P generation)

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Definitions:

Mitochondrion

A cell organelle that generates most of the cell's supply of adenosine triphosphate (ATP), used as a source of chemical energy.

Nucleus

A membrane-bound organelle in eukaryotic cells that contains most of the cell's genetic material, organized as multiple long linear DNA molecules in complex with a large variety of proteins.

Golgi Body

An organelle within eukaryotic cells that modifies, sorts, and packages proteins and lipids for transport out of the cell.

Myelinated Neurons

Myelinated neurons are nerve cells covered with a fatty substance called myelin, which increases the speed at which electrical signals travel along the nerve fibers.