Why is genetic variation necessary for natural selection to occur?

In what stage of meiosis is crossing over most likely to occur? a. Prophase I b. Anaphase II c. Metaphase I d. Prophase II

Microarrays allow for a comparison of expression of different genes under different growth conditions. the analysis of global gene expression. the hybridization of cDNA (converted from mRNA with DNA affixed to a solid-state support. all of the above.

Two parents, each with TT gene alleles, are true breeding and are crossed. Which alleles will their offspring have? A. tt B. Tt C. tT D. TT

What is a limiting factor

Jennifer agrees that a sample of her DNA may be used in a scientific study. The scientists will analyze the sample and compare it with information in data bases.

Describe how a flu vaccine the human body?

Adults do not need foods from the dairy group, only growing children and athletes do.

The principle role for sugars in living things is to

Under which condition is competition among fish most likely

What converts energy from sunlight to chemical energy in a cell?