In spite of being pure in respect of one trait, what else could an organism be in respect of another trait?

Which would be the genotypic and phenotypic ratio in the F2 generation of a hybrid cross in case of incomplete dominance? (a) 2 : 1 : 1 (b) 1 : 1 : 1 (c) 1 : 2 : 1 (d) 1 : 2 : 2

With the help of a checkerboard show the phenotypic ratio of offspring produced in F2 generation as a result of a cross between a pure black coloured and rough-haired guinea pig and a pure white and smooth-haired guinea pig. "Father plays the main role in the determination of sex of the offspring" - justify the statement with the help of a checkerboard. [3+2=5] OR Write three reasons behind Mendel's success. Establish a relationship between phenotype and genotype with the help of proper examples. [3+2=5]

An inherent trait of organisms is the prodigality of reproduction; as a result, the number of organisms increases in a geometric proportion - justify the validity of the statement with two proper examples.

Write two reasons behind the selection of pea plants by Mendel for his experiments on heredity.

Match the words in column-A with the most appropriate words in column B and re-write the correct pair mentioning the serial no. of both columns COLUMN - A COLUMN - B 1. Meninges (a) Decrease in the number of digits in the legs 2. Sexual reproduction (b) Submergence of islands 3. Roller tongue (c) Centromere 4. Evolution of the horse (d) Telomere 5. Environmental problem of Sundarban (e) Protects brain and spinal cord from mechanical injury 6. Attaches chromosome with spindle fibre (f) Controlled by autosome (g) Occurs through the production of gametes and their union

In which of the following crosses, will the F1 generation seed's tall and dwarf traits appear in a 1:1 ratio? (a) Tt x Tt (b) TT x Tt (c) TT x tt (d) Tt x tt

What will be the phenotypic ratio of progeny obtained from the hybridization between YyRR and YYrr genotypes? (a) 2:1 (b) 1:2 (c) 2:2 (d) 1:4

If a population undergoes three generations, and if each generation consists of only males, what is the probability that females will be present in the fourth generation? (a) 100% (b) 0% (c) 50% (d) 75%

What is the numerical ratio of the four genotypes BBRR, BBrr, bbRR and bbrr produced in the F2-generation resulting from dihybrid cross in Guinea pig? (a) 1 : 1 : 1 : 1 (b) 2 : 4 : 2 : 4 (c) 4 : 2 : 2 : 1 (d) 2 : 4 : 1 : 2

As the gene responsible for haemophilia is recessive, so the symptoms of this disease is only manifested in ____ condition.

Determine the nature of the pea plant germinated from the seed produced as a result of pollination between a hybrid tall (Tt) and a pure dwarf (tt) pea plant: (a) 100% Tall (b) 50% Tall, 50% Dwarf (c) 100% Dwarf (d) 75% Tall, 25% Dwarf