List Any Two Contrasting Characters Other than Height that Mendel Used in His Experiments in Pea Plants. - Science


List any two contrasting characters other than height that Mendel used in his experiments in pea plants.



The two contrasting traits other than height used by Mendel are:-

(i) Pod colour - Green pod colour was dominant over yellow colour

(ii) Seed shape - Round seed shape was dominant over wrinkled seed shape

Concept: Heredity
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2013-2014 (March) Delhi Set 2

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Define heredity.

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

With the help of two suitable examples, explain why certain experiences and traits earned by people during their lifetime are not passed on to their next generations. When can such traits be passed on?

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

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

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.


Explain the mechanism of hereditary changes.

Mendel, in one of his experiments with pea plants, crossed a variety of pea plant having round seeds with one having wrinkled seeds. State Mendel’s observations giving reasons of F1 and F2 progeny of this cross. Also, list any two contrasting characters, other than round seeds of pea plants that Mendel used in his experiments.

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.

Two pink coloured flowers on crossing resulted in 1 red, 2 pink and 1 white flower progeny. The nature of the cross will be

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?

If a tall pea plant is crossed with a pure dwarf pea plant then, what percentage of F1 and F2 generation respectively will be tall?

Figures (a) to (d) given below represent the type of ear lobes present in a family consisting of 2 children - Rahul, Nisha and their parents.

(a) Rahul's Father

(b) Rahul

(c) Rahul's Mother

(d) Rahul's sister Nisha



Types of ear lobes

Excited by his observation of different types of ear lobes present in his family, Rahul conducted a survey of the type of ear lobes found {Figure (e) and (f)} in his classmates. He found two types of ear lobes in his classmates as per the frequency given below:

Sex Free Attached
Male 36 14
Female 31 19

On the basis of the above data answer the following questions.

  1. Which of the two characteristics - ‘free ear lobe’ or ‘attached ear lobe’ appears to be dominant in this case? Why?
  2. Is the inheritance of the free ear lobe linked with the sex of the individual? Give a reason for your answer.
  3. What type of ear lobe is present in father, mother, Rahul and his sister Nisha? Write the genetic constitution of each of these family members which explains the inheritance of this character in this family.
    (Gene for the Free ear lobe is represented by F and the gene for the attached ear lobe is represented by f for writing the genetic constitution).
    Suresh’s parents have attached ear lobes. What type of ear lobe can be seen in Suresh and his sister Siya? Explain by giving the genetic composition of all.


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