Question

question 45
1.5 pts
what was mendels explanation for his observation that traits that had disappeared in the f1 generation reappeared in the f2 generation of the pea plants he used in his experiments?
new mutations were frequently generated in the f2progeny,
einventing\ traits that had been lost in the f1.
the mechanism controlling the appearance of traits was different between the f1and the f2
traits can be dominant or recessive, and the recessive traits were \hidden\ by the dominant ones in the f1.
the traits were lost in the f1due to dominance of the parental traits.

Explanation:

Mendel's work on pea plants led to the discovery of dominant and recessive traits. In the F1 generation, when two pure - breeding parents (one with a dominant trait and one with a recessive trait) are crossed, the offspring (F1) show the dominant trait because the recessive trait is masked. In the F2 generation, when F1 individuals are self - crossed, the recessive trait can reappear because the alleles segregate during gamete formation.

• Option 1: New mutations are not the reason for the reappearance of traits in Mendel's experiments. His work was based on the segregation of pre - existing alleles, not new mutations.
• Option 2: The mechanism of trait inheritance (based on alleles and their dominance/recessiveness) is consistent between F1 and F2 generations.
• Option 3: This is correct. Recessive traits are hidden by dominant traits in the F1 generation (when F1 has one dominant and one recessive allele), but when F1 individuals reproduce, the recessive alleles can combine in the F2 generation to show the recessive trait.
• Option 4: The traits are not "lost" in F1. They are just masked by the dominant trait. The alleles for the trait are still present in the F1 individuals.

Answer:

C. Traits can be dominant or recessive, and the recessive traits were "hidden" by the dominant ones in the F1.