Principles of Inheritance and Variation · Question 5

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