+91-8076753736 support@wiredfaculty.com
logo
logo

Sponsor Area

Principles Of Inheritance And Variation

Question
CBSEENBI12047170
Wired Faculty App

Which one of the following conditions in chromosome number is called monosomy?

  • 2n + 1

  • 2n + 2

  • 2n - 1

  • 2n - 2

Solution

C.

2n - 1

Monosomy is the condition of having a diploid chromosome complement in which one chromosome lacks its homologous partner. Eg, Turner's Syndrome.

In Turner's Syndrome, there is presence of 45 pair of chromosomes,ie, (2n - 1) XO. It occurs only in females. These females do not mature sexually and are sterile. They have Short stature and normal intelligence.

Tetrasomy or 2n + 2 is a form of aneuploid with the presence of four copies of chromosomes.

Trisomy or 2n + 1 is a chromosomal disorder characterised by an additional chromosome. Eg, Down's syndrome, Patau's syndrome etc.

Nullisomy or 2n-2 is a genetic condition involving the lack of both the normal chromosomal pair for a species.

Some More Questions From Principles of Inheritance and Variation Chapter

Name one trait that does not blend.

Give one example of genetic trait for each of the following in humans : (i) Lethality (ii) Multiple allelism.

What for symbols AA and Aa stand ?

Mention the phenomenon of pleiotropy by giving an example.

Name the plant that shows incomplete dominance in respect of the colour of its flower.

Write the genotypes of man with blood group A.

What is Mendel’s monohybrid phenotypic ratio ?

Write down Mendel’s dihybrid Phenotypic ratio 

Who were the rediscoverers of Mendelism ?

What are the real determinants of what an organism will become ?

Mock Test Series

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation