What does it mean if there are two different alleles for a trait. a. the trait is always homozygous b. that trait is the same for everyone c. the trait could show up in two different forms d. there are a total of two possible genotypes for that trait

Option C

Explanation:

If a trait is represented by two different alleles then genotype for such trait would be heterozygous. A homozygous genotype has same alleles for a given trait. Thus, option A is correct.  

Now this heterozygous can express in three different forms - a) it can express the trait of dominant allele, b) it can express co-dominance, and c) it can express incomplete dominance. Thus, option C is correct. One form will be the form where the dominant allele will express in a homozygous genotype and the other form will be any of the three options given above.  

d bonding propertys

explanation:

carbon can form so many different compounds not just with oxygen