Principles of Inheritance and Variation

Which of the following statements are true with reference to the sex-determination in honeybees? Choose the correct answer from the options given below :

1. A, B, C and E only
2. A, B, C and D only
3. B, C, D and E only
4. A, B, D and E only

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 ?

1. Phenylketonuria
2. Haemophilia
3. Sickle-cell anaemia
4. Thalassemia

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

1. 0%
2. 50%
3. 25%
4. 75%

The sixth mutant codon of beta globin gene causing polymerization of Haemoglobin and change in RBC shape is .

1. CAG
2. AUG
3. GUG
4. GAG

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 .

1. females and males, respectively
2. males and females, respectively
3. all males
4. all females

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the most appropriate answer from the options given below:

1. A is not correct but R is correct
2. Both A and R are correct and R is the correct explanation of A
3. Both A and R are correct but R is not the correct explanation of A
4. A is correct but R is not correct

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

1. Father : IA IB and Mother : IA i
2. Father : IA i and Mother : IA i
3. Father : IA i and Mother : IB i
4. Father : IB i and Mother : IB i

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below:

1. Statement I is incorrect but Statement II is correct
2. Both Statement I and Statement II are correct
3. Both Statement I and Statement II are incorrect
4. Statement I is correct but Statement II is incorrect

What is the pattern of inheritance for polygenic trait?

1. Autosomal dominant pattern
2. X-linked recessive inheritance pattern
3. Mendelian inheritance pattern
4. Non-Mendelian inheritance pattern

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 F3 generation. [figure]

1. 1/8
2. Zero
3. 1/4
4. 1/2

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?

1. Phenotypic ratio - 9 : 3 : 3 : 1
2. Phenotypic ratio - 9 : 7
3. Phenotypic ratio - 1 : 2 : 1
4. Phenotypic ratio - 3 : 1

Which one of the following can be explained on the basis of Mendel's Law of Dominance? Choose the correct answer from the options given below:

1. A, B and C only
2. A, C, D and E only
3. B, C and D only
4. A, B, C, D and E

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

1. Only red flowered plants
2. Red flowered as well as pink flowered plants
3. Only pink flowered plants
4. Red, Pink as well as white flowered plants

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

1. BB
2. bb
3. Bb
4. BB/Bb

As per ABO blood grouping system, the blood group of father is B+, mother is A+ and child is O+. Their respective genotype can be Choose the most appropriate answer from the options given below :

1. A only
2. B only
3. C & B only
4. D & E only

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below.

1. Statement I is true but Statement II is false
2. Statement I is false but Statement II is true
3. Both Statement I and Statement II are true
4. Both Statement I and Statement II are false

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below:

1. Statement I is true but Statement II is false
2. Statement I is false but Statement II is true
3. Both Statement I and Statement II are true
4. Both Statement I and Statement II are false

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.

1. TtRr
2. TtRR
3. TTRR
4. TTRr

Aneuploidy is a chromosomal disorder where chromosome number is not the exact copy of its haploid set of chromosomes, due to : Choose the most appropriate answer from the options given below :

1. C and D only
2. D and E only
3. A and B only
4. B and C only

The mother has A+ blood group, the father has B+ and the child is A+. What can be the possibility of genotypes of all three, respectively? Choose the correct answer from the options given below:

1. C and D
2. D and A
3. A and B
4. B and E

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

1. Sutton and Boveri
2. Alfred Sturtevant
3. Henking
4. Thomas Hunt Morgan

The phenomenon of pleiotropism refers to

1. Presence of two alleles, each of the two genes controlling a single trait
2. A single gene affecting multiple phenotypic expression
3. More than two genes affecting a single character
4. Presence of several alleles of a single gene controlling a single crossover

Which of the following statements are correct about Klinefelter’s Syndrome? Choose the correct answer from the options given below :

1. C and D only
2. B and E only
3. A and E only
4. A and B only

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

1. Turner’s syndrome
2. Klinefelter’s syndrome
3. Thalassemia
4. Down’s syndrome

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

1. [figure]
2. [figure]
3. [figure]
4. [figure]

XO type of sex determination can be found in :

1. Drosophila
2. Birds
3. Grasshoppers
4. Monkeys

Given below are two statements: In the light of the above statements, choose the correct answer from the options given below :

1. Both Statement I and Statement II are correct
2. Both Statement I and Statement II are incorrect
3. Statement I is correct but Statement II is incorrect
4. Statement I is incorrect but Statement II is correct

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

1. Sickle cell anaemia
2. Myotonic dystrophy
3. Haemophilia
4. Thalassemia

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). In the light of the above statements, choose the correct answer from the options given below :

1. Both (A) and (R) are correct and (R) is the correct explanation of (A)
2. Both (A) and (R) are correct but (R) is not the correct explanation of (A)
3. (A) is correct but (R) is not correct
4. (A) is not correct but (R) is correct

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

1. 25%
2. 50%
3. 75%
4. 100%