Heredity and Ev...

The recessive state for seed coat colour is

Which of the following statement is true?

'Feather was used for insulation in cold weather but later, they become useful for flight'. This statement describes:

With respect to the Darwin's theory of natural selection, which of the following is true for the organisms that are best suited to their environment?

Study the following and select the correct statements.

A group of laboratory mice having tails are bred together and their progeny is studied. The progeny had tails. However, scientist surgically removed the tails of the progeny and again bred them for four successive generations. What do you think would be the nature of the new progeny?

Homologous organs are:

Phenotype is influenced by

Choose the correct answer from the alternatives given.
In tomatoes, red fruit (R) is dominant over yellow fruit (r) and tallness (T) is dominant over dwarfness (t). A plant that is RrTT is crossed with a plant that is rrTt. What are the chances of an offspring being heterozygous for both traits?

Choose the correct answer from the alternatives given.

In a certain plant, yellow fruit colour (Y) is dominant to green fruit colour (y) and round shape (R) is dominant to oval shape (r). The two genes involved are located on different chromosomes.
Which of the following is correct for the condition when plant YyRr is back crossed with the double recessive parent?