What is heredity?

What are genes?

What is an allele?

What is the difference between phenotype and genotype?

heredity = the passing on of physical or mental characteristics genetically from one generation to another.

genes = a unit of heredity which is transferred from a parent to offspring and is held to determine some characteristic of the offspring

allele = one of two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome.

phenotype vs genotype = An organism's genotype is the set of genes in its DNA responsible for a particular trait. An organism's phenotype is the physical expression of those genes

Explanation:

remember phenotype = physical display of those properties

Heredity: The passing on of physical or mental characteristics genetically from one generation to another.

Genes: In biology, a gene is a sequence of nucleotides in DNA or RNA that encodes the synthesis of a gene product, either RNA or protein. During gene expression, the DNA is first copied into RNA. The RNA can be directly functional or be the intermediate template for a protein that performs a function.

Allele: An allele is a variant form of a given gene, meaning it is one of two or more versions of a known mutation at the same place on a chromosome. It can also refer to different sequence variations for a several-hundred base-pair or more region of the genome that codes for a protein.

Difference: The two terms are often used at the same time to describe the same organism, but there is a difference between genotype and phenotype:An organism's genotype is the set of genes in its DNA responsible for a particular trait. An organism's phenotype is the physical expression of those genes.

Explanation:

the correct option is option d