Science : Ch 09 – Heredity and Evolution

What is the phenotypic ratio obtained in Mendels dihybrid cross

Laws of inheritance were proposed by

A group of grass hoppers – some green and some brown-lived in grassland having dry bushes and dry grass. Name the phenomeneon

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

Name the plant Mendel used of F1 & F2 generation cross of tall and short plant experiment.

Total number of chromosomes along with the sex chromosomes that are present in a human female and a human male.

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 first person to give scientific explanation for the mechanism of transmission of characters from parents to the offsprings.

The Phenomeneon of Natural Selection was done by

A basket of vegetables contains carrot, potato, radish and tomato. Which of them represent the exact homologous structures?

A trait in an organism is infuenced by:

The number of pair(s) of sex chromosomes in the zygote of humans is

Choose the statements that describe the characteristics of genes:

1. Genes are specifc sequence of bases in a DNA molecule
2. A gene does not code for proteins.
3. In individuals of a given species, a specifc gene is located on a particular chromosome.
4. Each chromosome has only one gene

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: