Principles of Inheritance and Variation

For a person with blood group 'O', which of the following is not a possible combination of parents' blood group genotypes?

Given below are two statements :
Statement I : Down's syndrome is caused by the absence of one of the X-chromosomes.
Statement II : Turner's syndrome is caused by the presence of an additional copy of the chromosomes.
In the light of the ab...

Given below are two statements : one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : In an experiment, Mendel observed that the F1 progeny plants are all tall and none are dwarf.
Reason R : Stem height is a c...

What is the probability of having children with 'O' blood group, where both mother and father are heterozygous for ' $\underline{\mathrm{A}}$ ' and ' $\underline{\mathrm{B}}$ ' blood group, respectively?

In a population of a grasshopper species, the chromosome number of some members is 23 and some other members possess 24 chromosomes. The 23 and 24 chromosome-bearing members in this species are $\_\_\_\_$ .

Which one of the following disorders is caused by the substitution of Glutamic acid (Glu) by Valine (Val) at the sixth position of the beta globin chain of the haemoglobin molecule?

Which of the following statements are true with reference to the sex-determination in honeybees?
A. An offspring formed from the union of a sperm and an egg, develops as a female (queen or worker).
B. An unfertilized egg develops as a male ...

\(\text { Match List I with List II : }\)


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Genes $R$ and $Y$ follow independent assortment. If RRYY produce round yellow seeds and rryy produce wrinkled green seeds, what will be the phenotypic ratio of the F2 generation?

With the help of given pedigree, find out the probability for the birth of a child having no disease and being a carrier (has the disease mutation in one allele of the gene) in $F_3$ generation.

What is the pattern of inheritance for polygenic trait?

When a tall pea plant with round seeds was selfed, it produced the progeny of :
(a) Tall plants with round seeds and
(b) Tall plants with wrinkled seeds.
Identify the genotype of the parent plant.

Aneuploidy is a chromosomal disorder where chromosome number is not the exact copy of its haploid set of chromosomes, due to :
A. Substitution
B. Addition
C. Deletion
D. Translocation
E. Inversion
Choose the most appropriate answer from the...

The mother has \(\mathrm{A}+\) blood group the father has \(\mathrm{B}+\) and the child is \(\mathrm{A}+\). What can be the possibility of genotypes of all three, respectively?
A. \(I^A I^A|I B i| I^B i\)
B. $$I^A I^A\left|I^B i\right| I^A ...

Given below are two statements:
Statement I: When many alleles of a single gene govern a character, it is called polygenic inheritance.
Statement II: In Polygenic inheritance, the effect of each allele is additive.
In the light of the above...

Match List-I with List-II:

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A pink flowered Snapdragon plant was crossed with a red flowered Snapdragon plant. What type of phenotype/s is/are expected in the progeny?

As per ABO blood grouping system, the blood group of father is \(\mathrm{B}^{+}\), mother is \(\mathrm{A}^{+}\) and child is \(\mathrm{O}^{+}\). Their respective genotype can be
A. IBi/IAi/ii
B. IBIB/IAIA/ii
C. iIB/iIA/IAIB
D. IAi/IBi/IAi
E...

In a plant, black seed color \((\mathrm{BB} / \mathrm{Bb})\) is dominant over white seed color \((\mathrm{bb})\). In order to find out the genotype of the black seed plant, with which of the following genotype will you cross it?

Match List I with List II

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Which one of the following can be explained on the basis of Mendel's Law of Dominance?
A. Out of one pair of factors one is dominant and the other is recessive.
B. Alleles do not show any expression and both the characters appear as such in...

Select the correct statement/s with respect to
mechanism of sex determination in Grasshopper.
(A) It is an example of female heterogamety.
(B) Male produces two different types of gametes
either with or without X chromosome.
(C) Tot...

A certain plant homozygous for yellow seeds and
red flowers was crossed with a plant homozygous
for green seeds and white flowers. The F1 plants had yellow seeds and pink flowers. The F1 plants were selfed to get F2 progeny. Assuming inde...

In which disorder change of single base pair in the
gene for beta globin chain results in change of
glutamic acid to valine ?

A heterozygous pea plant with violet flowers was crossed with homozygous pea plant with white flower. Violet is dominant over white. Which one of the following represents the expected combinations among 40 progenies formed?

Match List - I with List - II.

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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-

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 expr...

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

A normal girl, whose mother is haemophilic marries a male with no ancestral history of haemophilia. What will be the possible phenotypes of the offspring?
(a) Haemophilic son and haemophilic daughter.
(b) Haemophilic son and carrier daughte...

Select the incorrect match regarding the symbols used in the Pedigree analysis:

If a female individual is with small round head, furrowed tongue, partially open mouth and broad palm with characteristic palm crease. Also the physical, psychomotor and mental development is retarded. The karyotype analysis of such an indi...

What is the expected percentage of F2 progeny with yellow and inflated pod in dihybrid cross experiment involving pea plants with green coloured, inflated pod and yellow coloured constricted pod?

The chromosomal theory of inheritance was proposed by

In meiosis, crossing over and exchange of genetic material between homologous chromosomes are catalyzed by the enzyme

Given below are two statements:
Statement I : Sickle cell anaemia and haemophilia are autosomal dominant traits.
Statement II : Sickle cell anaemia and haemophilia are disorders of the blood.
In the light of the above statements, choose the...

The recombination frequency between the genes a & c 5&, b & c is 15%, b & d is 9%, a & b is 20%, c & d is 25% and a & d is 29%. What will be the sequence of these genes on a linear chromosome?

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

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 chromoso...

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

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 ...

XO type of sex determination can be found in :

In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny will be diseased?

Now-a-days it is possible to detect the mutated gene causing cancer by allowing radioactive probe to hybridise its complimentary DNA in a clone of cells, followed by its detection using autoradiography because:

The production of gametes by the parents, formation of zygotes, the F1 and F2 plants, can be understood from a diagram called :

Select the correct match

Experimental verification of the chromosomal
theory of inheritance was done by

How many true breeding pea plant varieties
did Mendel select as pairs, which were similar
except in one character with contrasting
traits?