which of the following observations led mendel to conclude that some traits
were recessive?
a. plants with a certain form of each trait were more likely to survive
and reproduce than plants with other forms of each trait.
b. the offspring produced during his first set of experiments
expressed one form of a trait, while the offspring produced during
his second set of experiments expressed a different form of the
trait
c. when he crossed plants that expressed different forms of a trait,
one form always "disappeared" and never "reappeared in later
generations.
d. the form of a trait that seemed to "disappear" during his first setto
of experiments "reappeared during his second set of
experiments.

The correct option is D. The form of a trait that seemed to "disappear" during his first set  of experiments "reappeared during his second set of  experiments.

Explanation:

Gregor Mendel was an Austrian monk and his findings in genetics led to the foundation of this field. Hence, he is known as the father of genetics.

To study the patterns of inheritance, Mendel used pea plants and took seven traits of the plant into consideration.

Mendel observed that when two parent pea plants (P1 and P2) were crossed, the F1 progeny was similar to one of the parents (say P1). He wondered whether the traits of the other parent would be found in any other progeny. He then self-fertilized F1 pea plants and found out that some of the F2 progeny has traits of the other parent (P2). He hence realized that some of the traits are recessive.

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