PART - 2 CH - 8 Heredity Science - PART - 2 CH - 8 Heredity

A Mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. The progeny all bore violet flowers, but almost half of them were short. This suggests that the genetic make-up of the tall parent can be depicted as...

What is formed in independently inherited traits when plants showing different characteristics are bred?

By what is a trait in an organism influenced?

Statement A : All children will inherit an X-chromosome from their mother.
Reason R : Women have a perfect pair of both X-sex chromosome.
Which is correct option for Statement A and Reason R?

A snail can change its sex. What does it indicate?

________ animal can change sex.
(Lizard, Snail, Frog)

Selection of variants by environmental factors forms the basis for ________ processes. (Evolutionary, Metabolic, Digestive)

_________ presented the main rules of inheritance. (Mendel, Darwin, Lamarck)

When tall pea plant (TT) and short pea plant (tt) were hybridized, it produced all tall progeny because tallness is ________ trait. (Dominant, Recessive, Neutral)

In somatic cells of human being, the chromosomes are found in _________ pairs.  (23, 46, 22)

A child who inherits a ' Y ' chromosome from the Father will be a girl.

Snail is an animal that can change its sex.

In the experiment performed by Mendel on dihybrid inheritance, there are four types of plants formed in the F₁ generation.

Men have one Y-chromosome of normal size and other a short-sized X-chromosome.

A section of protein that provides information for the DNA is called the gene.

What is the meaning of characteristics?

Can asexually reproducing organisms follow similar rules of inheritance? Why?

How do germ cells make a single set of genes from the normal two copies in all other cells of body?

According to Mendel's experiment, the tall plants in F₁ generation were exactly the same as the tall plants of the parent generation? Why?

How is equal genetic contribution of male and female parents ensured in the progeny?

A study found that children with light coloured eyes are likely to have parents with light coloured eyes. On this basis, can we say anything about whether the light eye colour trait is dominant or recessive ? Why or why not?

A man with blood group A marries a woman with blood group O and their daughter has blood group O. Is this information enough to tell you which of the traits blood group A or O is dominant? Why or why not?

How do Mendel's experiments show that traits may be dominant or recessive?

What is the meaning of similarities and differences?

Everyone should have knowledge about his/her blood group as well as the blood group of family members. There are four blood group A, B, AB and O.
You consult your family doctor and get more knowledge about blood group.
(1) How is the knowledge of blood grouping essential?
(2) Whether the blood group of an individual is a hereditary character or an acquired character?
(3) Whether the son inherits blood group from his father and the daughter inherits blood group from her mother?
(4) Whether the blood group of the offspring is under the influence of both the parents (father and mother)?
(5) Whether the genes of blood groups have their dominant and recessive expression?

Ramesh has two daughters and his wife Maya is pregnant again. He desires to have a son. So he forces his wife Maya to go for sonography for sex determination of the child.
Answer the questions based on this information.
(1) Who is responsible for the birth of a girl or boy child, father's or mother's sex chromosome?
(2) In case of Ramesh's daughters, which set of sex chromosome is not present in them?
(3) Is sex determination test illegal? Why?

How is the sex of the child determined in human beings?

How do Mendel's experiments show that traits are inherited independently?

When pea plants showing pair of two different characteristics are bred with each other.

	Characters		Different characteristics
1.	Height of Plant	1.	Tall and short
2.	Shape of seed	2.	Round and wrinkled

 Answer the following questions :
(1) What do the progeny of cross made between tall plant with round seeds and a short plant with wrinkled seeds look - like?
(2) Which traits are dominant?
(3) What happens when F₁ progeny are used to generate F₂ progeny by self-pollination?

Outline a project which aims to find the dominant coat colour in dogs.

Describe the sex determination in human beings.###Explain the process of sex determination in humans.

What is sex determination? State the different methods of sex determination in animals.

Which mechanism of inheritance is used by all sexually reproducing organisms?###How does the mechanism of heredity work?

How do proteins control the characteristics? Explain with suitable example.###How are traits controlled by genes?