wiz-icon
MyQuestionIcon
MyQuestionIcon
10
You visited us 10 times! Enjoying our articles? Unlock Full Access!
Question

Down's syndrome and Turner's Syndrome occur in human beings due to

A
Monosomic and nullisomic conditions respectively
No worries! We‘ve got your back. Try BYJU‘S free classes today!
B
Monosomic and trisomic conditions respectively
No worries! We‘ve got your back. Try BYJU‘S free classes today!
C
Trisomic and monosomic conditions respectively
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
D
Trisomic an tetrasomic conditions respectively
No worries! We‘ve got your back. Try BYJU‘S free classes today!
E
Nullisomic and monosomic conditions respectively
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is C Trisomic and monosomic conditions respectively
Presence of one extra chromosome than the normal chromosome number in a diploid species is known as trisomy (2n+1). Monosomy is a aneuploid condition where one homologous chromosome is missing (2n-1). Nullisomy is a aneuploid condition where one pair of homologous chromosome is missing (2n-2). Presence of one chromosome in four copies is known as tetrasomy (2n+2). Presence of full or partial extra three copies of chromosome 21 causes Down's syndrome. Hence, it is trisomy 21 and is represented as 45 +XY or 45+XX. Absence of one X-chromosome causes Turner's Syndrome which is represented as 44 +XO and is a monosomic condition.

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
Skeletal System
BIOLOGY
Watch in App
Join BYJU'S Learning Program
CrossIcon