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
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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

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

Define heredity.

To perform an experiment to identify the different parts of an embryo of a dicot seed, first of all you require a dicot seed. Select dicot seeds from the following group:
Wheat, Gram, Maize, Pea, Barley, Ground-nut
(A) Wheat, Gram and Pea
(B) Gram, Pea and Ground-nut
(C) Maize, Pea and Barley
(D) Gram, Maize and Ground-nut 

What constitutes the link between one generation and the next?


   What is the genotype of dwarf plants which always produced dwarf offspring?

For his experiments on heredity, Mendel used :
 papaya plants
 potato plants
 pea plants
 pear plants


In order to ensure that he had pure-breeding plants for his experiments, Mendel :
(a) cross-fertilised each variety with each other
(b) let each variety self fertilise for several generations
(c) removed the female parts of the plants
(d) removed the male parts of the plants.


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 pea plants A are crossed with pure-bred pea plants B. It is found that the plants which look like A do not appear in F1 generation but re-emerge in F2 generation. Which of the plants A and B are : (i) tall, and (ii) dwarf? Give reason for your answer.


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?


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.

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.

What are the components of the DNA molecule?

A cross between pea plant with white flowers (vv) and pea plant with violet flowers (VV) resulted in F2 progeny in which ratio of violet (VV) and white (vv) flowers will be ______.


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