+91-8076753736 [email protected]

-->

Genetics - Some Basic Fundamentals

Question

Wired Faculty App

Given below is a schematic diagram showing Mendel's experiment on sweet pea plants having axial flowers with round seeds (AARR) and terminal flowers with wrinkled seeds ( aarr). Study the same and answer the questions which follow:

(i) Give the phenoeype of F1 progeny.
(ii) Give the phenotypes of F2 progeny produced upon by the self-pollination of F1
progeny.
(iii)Give the phenotypic ratio of F2 progeny.
(iv)Name and explain the law induced by Mendel on the basis of the above

Solution

(i) All F1 progenies will have axial flowers and round seeds.

(ii) F2 phenotypes will be

• Axial flowers, round seeds (AARR, AARr, AaRr)

• Axial flowers, wrinkled seeds (AArr, Aarr)

• Terminal flowers, round seeds (aarr. aaRr)

• Terminal flowers, wrinkled seeds (aarr)

(iii) Phenotypic ratio of the F2 progeny: 9:3:3:1

Axial flowers, round seeds- 9

Axial flowers, wrinkled seeds - 3

Terminal flowers, round seeds- 3

Terminal flowers, wrinkled seeds- 1

(iv) Law of segregation: When the two members of a pair of factors separate during the formation of gametes, they do not blend but segregate or separate into different gametes.

Some More Questions From Genetics - Some Basic Fundamentals Chapter

Choose the correct answer from the four options given below:

The recessive gene is one which expresses itself in

Briefly explain the following terms.
Genes

Given below is a schematic diagram showing Mendel's experiment on sweet pea plants having axial flowers with round seeds (AARR) and terminal flowers with wrinkled seeds ( aarr). Study the same and answer the questions which follow:

(i) Give the phenoeype of F1 progeny.
(ii) Give the phenotypes of F2 progeny produced upon by the self-pollination of F1
progeny.
(iii)Give the phenotypic ratio of F2 progeny.
(iv)Name and explain the law induced by Mendel on the basis of the above

Give biological reasons for the following:

The wall of the ventricle is thicker than the auricle.

Name the following:

iv. The cross between two parents having one pair of contrasting characters.

Rewrite and complete the following sentences by inserting the correct word
in the space indicated:

__________ is the scientific name of garden pea, which Mendel used for his
experiments.

Briefly answer the following questions:

v. Mendel's Law of dominance

In a homozygous plant round seeds (R) are dominant over wrinkled seeds (r):

i. Draw a Punnett square to show the gametes and offspring when both the

plants have heterozygous round seeds (Rr).

ii. Mention the Phenotype and Genotype ratios of the offspring in F2 generation.

iii. Name the sex chromosomes in human males and females.

iv. Briefly explain the term ‘Mutation’.

v. What is the number of chromosomes in the gametes of human beings?

Rewrite and complete the following sentences by inserting the correct word in the

(iv) Phenotype is the observable characteristic which is ............ controlled.

Write the difference between the following pairs by following the indications in the

brackets:

Monohybrid and dihybrid cross (phenotypic ratio)

Mock Test Series

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation