A Mendelian experiment consisted of breeding tall pea plants bearing violet flowers with short pea plants bearing white flowers. - Science


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:


  • TTWW

  • TTww

  • TtWW

  • TtWw





It's possible that TtWW is caused by the parent's genes. Half of the offspring are short, which means that the parent plant will also have some short genes. All of the offspring had violet flowers, which is more evidence that violet is more common than white.

Concept: Heredity
  Is there an error in this question or solution?
Chapter 9: Heredity and Evolution - Exercises [Page 159]


NCERT Science Class 10
Chapter 9 Heredity and Evolution
Exercises | Q 1 | Page 159
Lakhmir Singh Class 10 Biology (Science)
Chapter 4 Heredity and Evolution
Exercise 1 | Q 76 | Page 195

Video TutorialsVIEW ALL [3]


How do Mendel’s experiments show that the traits may be dominant or recessive 

Define heredity.

Name the scientist who gave the laws of inheritance.

Give the contrasting traits of the following characters in pea plant and mention which is dominant and which is recessive :

 Round seed


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 ______  

Pure-bred tall pea plants are first crossed with pure-bred dwarf pea plants. The pea plants obtained in F1generation are then cross-bred to produce F2 generation of pea plants.
(a) What do the plants of F1 generation look like?
(b) What is the ratio of tall plants to dwarf plants in F2 generation?
(c) Which type of plants were missing in F1 generation but reappeared in F2 generation?


One of the following traits of the parents cannot be passed on to their future generations. This trait is :
(a) cleft chin
(b) pointed chin
(c) scarred chin
(d) broad chin

If we pure-bred tall (dominant) pea plant with pure-bred dwarf (recessive) pea plant we will get pea plants of F1 generation. If we now self-cross the pea plant of F1 generation, then we obtain pea plants of F2 generation.

(a) What do the plants of F2 generation look like?

(b) State the ratio of tall plants to dwarf plants in F2 generation.

(c) State the type of plants not found in F1 generation but appeared in F2 generation, mentioning the reason for the same.

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.

Define Heredity. Give two examples.

Answer the following question.
Name the plant Mendel used for his experiment. What type of progeny was obtained by Mendel in F1 and F2 generations when he crossed the tall and short plants? Write the ratio he obtained in F2 generation plants.

What is genetics?

Who is the pioneer of modern genetics?

Write advantages of science of heredity.

____________ refers to the transmission of genetic information from parental generation to next generation.

A cross between a tall plant (TT) and short pea plant (tt) resulted in progeny that were all tall plants because

What are the components of the DNA molecule?


      Forgot password?
Use app×