Advertisements
Advertisements
प्रश्न
One of the following traits of the parents cannot be passed on to their future generations. This trait is:
विकल्प
cleft chin
pointed chin
scarred chin
broad chin
Advertisements
उत्तर
scarred chin
Explanation:
Only genetic (inherited) traits are passed from parents to their offspring through genes. A cleft chin, pointed chin, and broad chin are inherited traits. A scarred chin is an acquired characteristic caused by injury and is not inherited.
संबंधित प्रश्न
How do Mendel’s experiments show that the traits may be dominant or recessive?
In one of his experiments with pea plants, Mendel observed that when a pure tall pea plant is crossed with a pure dwarf pea plant in the first generation, F1, only tall plants appear.
(a) What happens to the traits of the dwarf plants in this case?
(b) When the F1-generation plants were self-fertilised, he observed that in the plants of the second generation, F2, both tall plants and dwarf plants were present. Why it happened? Explain briefly.
Mendel in one of his experiments with pea plants crossed a variety having round seed with one having wrinkled seeds. Write his observations, giving reasons, of F1 and F2 progeny
List any two contrasting characters other than roundness of pea plants that Mendel used in his experiments with pea plants.
Outline a project which aims to find the dominant coat colour in dogs.
How is the equal genetic contribution of male and female parents ensured in the progeny?
Name the scientist who gave the laws of inheritance.
What sizes of plants are produced if both parents have genes Tt?
How do Mendel's experiments show that traits may be dominant or recessive?
In the human blood grouping, the four basic blood types are type A, type B, type AB, and type O. The blood proteins A and B are :
(a) simple dominant and recessive traits
(b) incomplete dominant traits
(c) codominant traits
(d) sex-linked traits
The following results were obtained by a scientist who crossed the F1 generation of pure-breeding parents for round and wrinkled seeds.
| Dominant trait | Recessive trait | No. of F2 offspring |
| Round seeds | Wrinkled seeds | 7524 |
From these results, it can be concluded that the actual number of round seeds he obtained was ______
A trait in an organism is influenced by ______
In humans, if gene B gives brown eyes and gene b gives blue eyes. What will be the colour of eyes of the persons having the following combination of genes?
(a) Bb
(b) bb
(c) BB
The term 'father of genetics' is used for the scientist :
(a) Morgan
(b) Mendel
(c) Darwin
(d) Marie Curie
The farmers have been cultivating a food plant X for over two thousand years and have produced as many as five entirely different looking vegetables A, B, C, D and E from it.
(a) What could the plant X be?
(b) What are A, B, C, D and E?
(c) What is the process of evolution involved in this example known as?
Explain the mechanism of hereditary changes.
Hereditary characters are transferred from parents to offspring by ______ hence they are said to be structural and functional units of heredity.
Who is the pioneer of modern genetics?
Assertion: When pure breed tall plants are crossed with pure breed short plants, all the plants in F1 progeny are tall. When the tall plants of F1 progeny are crossed, short plants re-appear in F2 progeny.
Reason: Traits are independently inherited.
