12. For an XX female to express a recessive sex-linked trait, she must have A. Y chromosome
B. an inactive allele
C. two recessive alleles
D. two dominant alleles

a "theory" a suggestion that is not 100 % accurate, or a figure. some people say its a theory because they of all the passed theory's about one subject. it depends sometimes theory might be accurate and sometimes they are.

1. efficient use of space

2. elimination of groundwater contamination

3. energy generation

4. lower carbon footprint

regents of the university of california v. bakke, 438 u.s. 265 (1978), was a landmark decision by the supreme court of the united states. it upheld affirmative action, allowing race to be one of several factors in college admission policy.