Question
Biology Question on Principles of Inheritance and Variation
Alleles are
different molecular forms of a gene
heterozygotes
different phenotype
true breeding homozygotes
different molecular forms of a gene
Solution
Genes are the units of inheritance and contain the information that is required to express a particular trait in an organism. Alternating forms of a single gene that code for a pair of contrasting traits are known as alleles. For example, two alleles determine the height of the pea plant (tall and dwarf). Principles of Inheritance and Variation 343 shape-Round (R)-Wrinkled (r).
Alleles are variations or forms of the same gene located at a specific chromosomal site. Alleles are generally present in pairs and control the same character or trait. Therefore, we can say alleles are an alternative form of a gene.