When the maternal and paternal chromosomes carry different alleles at the same locus, the genotype is called:

detailed solution

Correct option is D

When the maternal and paternal chromosomes carry different alleles at the same locus, the genotype is called heterozygous. Example: Tall pea plant can have a genotype of Tt. This is a heterozygous condition.A heterokaryon is a multinucleate cell that contains genetically different nuclei. It is often formed during protoplast fusion.When the maternal and paternal chromosomes carry same alleles at the same locus, the genotype is called homozygous. Example: Tall pea plant can have a genotype of TT. This is a homozygous condition.Heterokont is a terminology associated with flagellation. When an organism has two different types of flagella it is said to have heterokont flagellation.