Final answer:
In Mendelian genetics, a dominant allele can express its trait with just a single copy, while a recessive allele requires two copies for expression. 'Dominant' corresponds to the presence of a single allele, while 'Recessive' relates to the presence of two alleles. 'Multiple Options' suggests a complex inheritance pattern that doesn't directly correspond to simple dominant or recessive alleles.
Step-by-step explanation:
When discussing the expression of alleles in an organism, it's important to understand the concept of dominance in genetics. An allele is considered dominant if it can express its trait when only a single copy is present within an organism. Conversely, an allele is considered recessive when two copies are required for its trait to be expressed in the phenotype. The scenario described as 'presence of many alleles for the trait to be expressed' does not relate directly to the concepts of dominant or recessive inheritance, and instead may refer to multiple alleles or polygenic inheritance.
For the options given in the question:
- A) Presence of many alleles for the trait to be expressed.
- B) Presence of two alleles for the trait to be expressed.
- C) Presence of a single allele for the trait to be expressed.
The correct matches based on Mendelian genetics are:
- a) Dominant - C) Presence of a single allele for the trait to be expressed
- b) Recessive - B) Presence of two alleles for the trait to be expressed
- c) Multiple Options - A) This does not directly correspond to Mendelian dominant/recessive inheritance, but suggests a more complex inheritance pattern possibly involving multiple alleles or polygenic traits.