Question

A cross in which a single pair of contrasting characters is studied at a time is called ________.
(a) Monohybrid cross
(b) Dihybrid cross
(c) Trihybrid cross
(d) Tetrahybrid cross

Answer 1

Hint: Two individuals with homozygous genotypes, or genotypes with entirely dominant or absolutely recessive alleles, have a genetic combination, resulting in a certain genetic trait having opposite phenotypes.

Complete answer:
A monohybrid cross is a fusion between two individuals with homozygous genotypes that, for a certain genetic variant, result in the opposite phenotype." The cross between two monohybrid features is considered a monohybrid cross (TT and tt)." The inheritance of one gene is responsible for a monohybrid cross. It can clearly be seen in Punnett square. Geneticists use the monohybrid cross to observe how homozygous descendants transmit heterozygous genotypes inherited from their parents. Mendel started with a pair of pea plants with two opposing characteristics i.e., one tall and one dwarf, for the monohybrid cross. Tall plants have resulted in the cross-pollination of tall and dwarf plants. The hybrid plants were all tall. He named this as the first hybrid generation (F1), and the offspring were named filial1 or F1 progeny. He performed an experiment with all seven opposing pairs and discovered that one pattern in their behavior was exhibited by the whole F1 progeny, i.e., they resembled one of the parents. Fully missing was another parent character.
So, the correct option is (a) Monohybrid cross

Note: This is used by geneticists to observe how the descendants of homozygous persons transmit their parent’s heterozygous genotypes they inherit. This combination usually decides the dominant genotype. A monohybrid cross can also indicate that there is a genetic combination of two individuals who have heterozygous genotypes. The superiority of an allele is demonstrated by these crosses.