EASY
12th CBSE
IMPORTANT
Earn 100

What do you understand by a phenotype and a genotype? Explain by giving an example?

Important Questions on Principles of Inheritance and Variations

MEDIUM
12th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 5 - Principles of Inheritance and Variations>TEST QUESTIONS>Q 4
Define F1 & F2 generations.
MEDIUM
12th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 5 - Principles of Inheritance and Variations>TEST QUESTIONS>Q 5

What will be the genotypes of the parents if the offspring had phenotypes in the following proportion?

9:3:3:1

MEDIUM
12th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 5 - Principles of Inheritance and Variations>TEST QUESTIONS>Q 5

What will be the genotypes of the parents if the offspring had phenotypes in 1:1:1:1 proportion?

 

MEDIUM
12th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 5 - Principles of Inheritance and Variations>TEST QUESTIONS>Q 6
Drosophila can have the following alleles for eye colour: red, white, apricot, eosine, wine, coral, cherry etc. Show by diagram, how many of these alleles will be present in one fly?
MEDIUM
12th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 5 - Principles of Inheritance and Variations>TEST QUESTIONS>Q 7
How does a test cross help in identifying the genotype of the organism? Explain.
MEDIUM
12th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 5 - Principles of Inheritance and Variations>TEST QUESTIONS>Q 8
When a tall pea plant was self bred, it produced one-fourth of the progeny as dwarf. Explain with the help of a cross.
MEDIUM
12th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 5 - Principles of Inheritance and Variations>TEST QUESTIONS>Q 9
Why are F2 Phenotypic and genotypic ratios are the same in a cross between red-flowered snapdragon and white-flowered snapdragon plants? Explain with the help of a cross.
MEDIUM
12th CBSE
IMPORTANT
TRUEMAN'S ELEMENTARY Biology VOL. II For XII Class of 10+2>Chapter 5 - Principles of Inheritance and Variations>TEST QUESTIONS>Q 10
A relevant portion of β- chain of haemoglobin of a normal human is
Val - His - Leu - Thr - Pro - Glu - Glu
  1      2      3       4       5       6     7
The codon for this sixth amino acid is GAG. It mutates to GAA due to mutation 'A' and GUG due to mutation 'B'. Haemoglobin structure did not change as a result of mutation 'A' but mutation 'B' led to sickle cell shaped RBCs. Explain giving reasons how could mutation 'B' changed the haemoglobin structure and not mutation 'A'.