Exercise

The Swedish Twin Register collected data on smoking behaviour for identical twins and non-identical twins who had been reared in the same or different families. Data for twin boys are shown in the table.

Which are more similar in their smoking behaviour-identical twins or non-identical twins?

The Swedish Twin Register collected data on smoking behaviour for identical twins and non-identical twins who had been reared in the same or different families. Data for twin boys are shown in the table.

Which are more similar in their smoking behaviour-twins reared together or twins reared apart?

The Swedish Twin Register collected data on smoking behaviour for identical twins and non-identical twins who had been reared in the same or different families. Data for twin boys are shown in the table.

From the above table, we can conclude non-identical twins reared together are similar to smoking behaviour. What conclusion we can draw from this?

Explain the term' variation in species'.

Match the column

Which one of the following represents dwarf plant?

Assertion: Mendel successfully conducted his hybridisation experiments.
Reason: Garden pea was an ideal experimental material.

In the green gram, the development of two flowers at the axial position is a recessive character, while the development of a single flower at the axial position is a dominant character. If the dominant character is represented by 'SS' and the recessive by 'ss' then answer the following question:

Find out the phenotype ratio in the second generation (F₂ generation) after crossing pure parental varieties.