Principles of Inheritance and Variation NEET PYQs

The phenomenon of pleiotropism refers to:

Frequency of recombination between gene pairs on same chromosome as a measure of the distance between genes to map their position on chromosome, was used for the first time by:

Which of the following statements are correct about Klinefelter's Syndrome?
A. This disorder was first described by Langdon Down (1866).
B. Such an individual has overall masculine development. However, the feminine development is also expressed.
C. The affected individual is short stature.
D. Physical, psychomotor and mental development is retarded. E. Such individuals are sterile.
Choose the correct answer from the options given below:

Which one of the following symbols represents mating between relatives in human pedigree analysis?

Broad palm with single palm crease is visible in a person suffering from:

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:

XO type of sex determination can be found in:

Which of the following occurs due to the presence of autosome linked dominant trait?

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Mendel’s law of Independent assortment does not hold good for the genes that are located closely on the same chromosome.
Reason (R): Closely located genes assort independently.
In the light of the above statements, choose the correct answer from the options given below:

If a colour blind female marries a man whose mother was also colour blind, what are the chances of her progeny having colour blindness?