Science : Ch 09 – Heredity and Evolution

A zygote which has an X chromosome inherited from the father will develop into a

Assertion (A) : A single copy of ‘T’ is enough to make the plant tall. Reason (R) : Tallness trait (T) in Mendel’s experiment is a dominant trait.

The gene type of green stemmed tomato plants is denoted as GG and that of purple stemmed tomato plants as gg. What colour of stem would you expect in F1 progeny when these two are crossed?

Mendel crossed the round and green seeded pea plants with the wrinkled and yellow seeded pea plants. Give the phenotypic ratio of F2 generation.

A woman has only daughters which

Newly formed DNA copies

What is the phenotypic ratio obtained in Mendels dihybrid cross

Bacteria have a simpler body plan when compared with human beings. Does it mean that human beings are more evolved than bacteria?

Select correct option about variation?

1. The differences in characteristics between individuals of the same species is called variation.
2. Variations arise in organisms during the process of copying the DNA due to which the DNA copies will be similar but not identical to the original

The Phenomeneon of Natural Selection was done by

A trait in an organism is infuenced by:

Select the group which shares the maximum number of common characters

If a round, green-seeded pea plant (RR yy) is crossed with wrinkled, yellow seeded pea plant, (rr YY), the seeds production in F1 generation are:

A zygote which has an X chromosome inherited from the father will develop into a:

Some dinosaurs had feathers although they could not fly but birds have feathers that help them to fly. In the context of evolution this means that: