Answer:
A) Homologous chromosome pair
B) Allele pair
Explanation:
A) A chromosome pair that consists of same genes and that too at the same locus is called as a homologous chromosome pair. The homologous chromosome has identical alleles for a gene of a particular trait and based on that it can be dominant or recessive.
B) An allele pair however can be either homozygous dominant or recessive(RR or rr) or heterozygous (Rr)
