Question

what is a mono - hybrid cross?
crossing two different species
crossing two different traits simultaneously
crossing two individuals with the same trait

Explanation:

A monohybrid cross involves crossing two individuals that are heterozygous for a single trait. It focuses on the inheritance of one specific characteristic. For example, in pea plants, crossing two plants that are heterozygous for flower color (e.g., \(Pp\times Pp\) where \(P\) is the allele for purple flowers and \(p\) for white flowers). The other options are incorrect: crossing two different species is hybridization at a species - level (not the genetic cross - level for a single trait as in monohybrid cross). Crossing two different traits simultaneously is a dihybrid cross. And crossing two individuals with the same trait (if they are homozygous) would not show the segregation of alleles as in a monohybrid cross (which typically uses heterozygous parents to observe Mendelian ratios).

Answer:

None of the provided options are correct. A monohybrid cross is the cross between two individuals heterozygous for a single trait.