Describe the difference between dominant and recessive traits including homozygous and heterozygous alleles

a) Dominant traits always manifest, while recessive traits only appear in certain conditions.

b) Dominant traits are always expressed in the phenotype, while recessive traits require two copies of the gene.

c) Homozygous alleles refer to different gene pairs, while heterozygous alleles are identical.

d) Recessive traits are more common in the population compared to dominant traits.