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

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

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Solution

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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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

(e)

(f)

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).
    OR
    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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