Question

A character expressed in hybrid is ___________.
A. Dominant
B. Recessive
C. Codominant
D. Epistatic

Answer 1

Hint: A mendelian character is expressed in the heterozygous individual and is contributed by the parent. Alleles come in two different forms; one is denoted by a capital letter and the other one is denoted by a small letter. When two alleles of a gene are non-identical, they are regarded as heterozygous, where only the dominant allele will be expressed.

Complete answer: Gregor Mendel conducted a series of hybridization experiments from 1856-1863 on the garden pea plant. Based on these experiments, he proposed inheritance in living beings. He applied statistical and mathematical logic into inheritance patterns. His experiments had greater credibility due to the large sample size. Mendel conducted two experiments: In his first experiment, he considered only one character i.e. height and studied its inheritance pattern using a monohybrid cross. In his second experiment, he selected two characters i.e. seed shape and colour and studied their inheritance pattern using a dihybrid cross. He proposed three laws: the law of inheritance, law of independent assortment, and the law of segregation. According to the law of inheritance, in a heterozygous individual, only one trait is expressed and the second character is not expressed. The character which is expressed is known as the dominant character and the character that is not expressed is known as the recessive character. In the Punnett square, Y (green colour of the pea pod) was a dominant character, and y (yellow colour of the pea pod) was a recessive character.
Hence, the correct answer is option A.

Note: Gregor Mendel is often called “Father of Genetics”. Law of segregation states that two alleles of a single gene get separated at the time of gamete formation. Whereas, the law of independent assortment is based on the dihybrid cross; it states that one allele does not influence the other allele to segregate at the time of gamete formation.