Sexually reproducing organisms produce offspring with marked, significant and visible variation. Asexually reproducing offspring show minor variations.

i) Do you agree with the above statements?

ii) Among the following organisms point out the asexually reproducing organism.

(Cockroach, Euglena, Earthworm and Bird)

Mendel has observed Tallness as a dominant character in the garden pea plant.

Similarly, tongue rolling is a dominant character in man. In a group of 60 students,

45 can roll their tongue and 15 are non-rollers.

i) In the above context, calculate the percentage of dominant and recessive characters.

The inheritable characters vary in different species and within the same species. Name the variation in the following cases.

The eye colour among the human beings are varied as blue, black, brown, green, etc.

i) This is called as _______variation.

The dentition in the rabbit and the elephant are not the same.

ii) This is called as __________ variation.

Here are certain important hereditary jargons. Fill in the blanks by choosing a suitable one from the list given. (allele, variation, speciation, gene, allelomorphs)

i) __________ are the factors which form the physical basis of inheritance.

ii)__________ is the alternate forms of the same gene.

iii)__________ are the expressions of contrasting pair of alleles.

A change that affects the body cell is not inherited. However, a change in the gamete is inherited. The effects of radiation at Hiroshima have been affecting generations.

Analyze the above statements and give your interpretation.