1. Tardigrade
  2. Question
  3. Biology
  4. In which instance will the phenotypic and genotypic ratio be similar?

Q. In which instance will the phenotypic and genotypic ratio be similar?

NTA AbhyasNTA Abhyas 2020 Report Error

Solution:

Incomplete dominance or blending inheritance is the condition where F1 hybrids were not related to either of the parents but exhibited a blending of characters of two parents.
The inheritance of flower colour Antirrhinum majus (Snapdragon or Dog flower) is an example of incomplete dominance. This phenomenon is called incomplete dominance as neither of the two alleles of a gene is completely dominant over the other. In a cross between F1 pure red flowered plants (RR) and pure white flowered (rr) plants, the offspring obtained in the F1 generation were all pink (Rr). When these F1 plants were self-crossed, the plants in the F2 generation were red, pink and white in the phenotypic ratio 1 Red : 2 Pink : 1 White. This shows that 'R' is not completely dominant over 'r'.
$Parents & RR & \times & rr \\ Gametes & R & & r \\ F_{1} & & Rr & $
rr
Phenotypic ratio = $1$ Red : $2$ Pink : $1$ White
Genotypic ratio = $1$ RR : $2$ Rr : $1$ rr

Questions from NTA Abhyas 2020

1. The element which helps in oxygen evolution in the process of photosynthesis is

Photosynthesis in Higher Plants

2. Although much carbon dioxide is carried in the blood, yet blood does not become acidic because

Breathing and Exchange of Gases

3. The science of rearing, feeding, care, breeding and utilization of animals is called

Strategies for Enhancement in Food Production

4. Which one of the following statements is correct regarding blood pressure?

Body Fluids and Circulation

5. If the base sequence in one chain of DNA is GCATG, what shall be the sequence in the replicated complementary strand

Molecular Basis of Inheritance

Biology Most Viewed Questions

1. identify the substances having glycosidic bond and peptide bond, respectively in their structure

NEET 2020 Biomolecules

2. Choose the correct pair from the following

NEET 2020 Biotechnology : Principles and Processes

3. Match the following columns and select the correct option.
Column I Column II
a Gregarious, polyphagous pest i Asterias
b Adult with radial symmetry and larva with bilateral symmetry ii Scorpion
c Book lungs iii Ctenoplana
d Bioluminescence iv Locusta

NEET 2020 Animal Kingdom

4. In which of the following techniques, the embryos are transferred to assist those females who cannot conceive ?

NEET 2020 Reproductive Health

5. The roots that originate from the base of the stem are:

NEET 2020 Anatomy of Flowering Plants

6. In a cross between a male and female, both heterozygous for sickle cell anaemia gene, what percentage of the progeny will be diseased ?

NEET 2021 Principles of Inheritance and Variation

7. Which of the following is not an attribute of a population ?

NEET 2020 Organisms and Populations

8. Select the correct match

NEET 2020 Principles of Inheritance and Variation

9. Identify the wrong statement with reference to the gene T that controls ABO blood groups.

NEET 2020 Principles of Inheritance and Variation

10. The infectious stage of Plasmodium that enters the human body i s

NEET 2020 Human Health and Disease

Latest Updates