The genotype of vestigial wings in $Drosophila$ is . . . . . . .

Based on Mendel's monohybrid cross experiments,which of the following statements is $NOT$ true?

For geneticists,the year $1900 \, AD$ is of high significance due to:

Given below are two statements:
Statement $I$:
Mendel studied seven pairs of contrasting traits in pea plants and proposed the Laws of Inheritance.
Statement $II$:
Seven characters examined by Mendel in his experiment on pea plants were seed shape and colour,flower colour,pod shape and colour,flower position and stem height.
In the light of the above statements,choose the correct answer from the options given below:

Why was Mendel's work not accepted during his time?

$A$ modified allele is equivalent to an unmodified allele when it produces what?