Question

Discovery of Mendel’s law of segregation required the use of ______.

Options

• dihybrid parental and F₁ crosses

• plants showing incomplete dominance

• test crosses

• parental crosses with true-breeding plants followed by crosses with F₁ heterozygous plants

Answer 1

Discovery of Mendel’s law of segregation required the use of parental crosses with true-breeding plants followed by crosses with F₁ heterozygous plants.

Explanation:

Mendel's discovery of the law of segregation involved starting with parental crosses between true-breeding (homozygous) plants having contrasting traits, such as red (RR) and white (rr) flowers. The first filial (F₁) generation was heterozygous (Rr) and exhibited only the dominant trait. When these F₁ hybrids self-pollinated or were crossed, the alleles segregated during gamete formation, producing a phenotypic ratio of 3:1 in the F₂ generation.