In the given set of question, in the first question, the given blank can be filled with variables. In the second question, Mendel chose pea plant as they were easy to raise.
• Examining one trait at a time makes sure that multiple variables are not changing simultaneously.
• Mendel chose pea plants for his experiments as they are easy to raise, can produce several offspring in single mating, can fertilize themselves, and possess varieties in phenotype and genotype, which are observed easily.
• The mentioned features make pea plants suitable in the study of heredity and genetics.
Thus, in the first question, the given blank can be filled with variables, and in the second question Mendel chose pea plant as they were easy to grow, can produce many offspring, and possess varieties of genotypes and phenotypes.
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