Q31
A human female with Turner syndrome has
Correct Answer
Option A
Solution
(a) Turner syndrome (45,X): monosomy X, short stature, infertility, underdeveloped female features.
Principles of Inheritance and Variation
Q32
Among the following characters, which one was not considered by Mendel in his experiments on pea?
Correct Answer
Option A
Solution
(a) Trichome type was not among Mendel's seven traits.
Q33
tt mates with Tt. What will be the characteristic of offspring?
Correct Answer
Option B
Solution
(b) Cross tt x Tt gives 50% tt (recessive) and 50% Tt (heterozygous dominant).
Q34
The contrasting pairs of factors in Mendelian crosses are called
Correct Answer
Option B
Solution
(b) Allelomorphs = contrasting alleles controlling different expressions of the same character.
Q35
First geneticist / father of genetics was
Correct Answer
Option B
Solution
(b) Gregor Johann Mendel is the father of genetics.
Q36
Mendel's law of independent assortment is the law of
Correct Answer
Option C
Solution
(c) The Law of Independent Assortment states that alleles of different genes assort independently.
Q37
A dihybrid condition is
Correct Answer
Option D
Solution
(d) Dihybrid: heterozygous at both loci (Tt Rr).
Q38
The allele which is unable to express its effect in the presence of another is called
Correct Answer
Option D
Solution
(d) A recessive allele cannot express itself in the presence of a dominant allele.
Q39
Red (RR) Antirrhinum is crossed with white (WW). Offspring RW are pink. This is an example of
Correct Answer
Option B
Solution
(b) Incomplete dominance: F1 is intermediate (pink) between the two pure-breeding parents.
Q40
When a certain character is inherited only through female parent, it probably represents
Correct Answer
Option B
Solution
(b) Maternal/cytoplasmic inheritance: plasma genes transmitted only through maternal cytoplasm.
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