-
Engineering and Architecture
Exams
Colleges
Predictors
Resources
-
Computer Application and IT
Quick Links
Colleges
-
Pharmacy
Colleges
Resources
-
Hospitality and Tourism
Colleges
Resources
Diploma Colleges
-
Competition
Other Exams
Resources
-
School
Exams
Top Schools
Products & Resources
-
Study Abroad
Top Countries
Student Visas
-
Arts, Commerce & Sciences
Exams
Colleges
Upcoming Events
Resources
-
Management and Business Administration
Colleges & Courses
Predictors
-
Learn
Online Courses
Engineering Preparation
Medical Preparation
-
Online Courses and Certifications
Top Streams
Specializations
- Digital Marketing Certification Courses
- Cyber Security Certification Courses
- Artificial Intelligence Certification Courses
- Business Analytics Certification Courses
- Data Science Certification Courses
- Cloud Computing Certification Courses
- Machine Learning Certification Courses
- View All Certification Courses
Resources
-
Medicine and Allied Sciences
Colleges
Predictors
Resources
-
Law
Resources
Colleges
-
Animation and Design
Predictors & Articles
Colleges
Resources
-
Media, Mass Communication and Journalism
Colleges
Resources
-
Finance & Accounts
Top Courses & Careers
Colleges
Get Answers to all your Questions
- #National Eligibility Cum Entrance Test
- #Genetics and Evolution
- #Biology
- #Medical
- #National Eligilibility Cum Entrance Test
- #Class 12
Inversions are considered as crossover suppressors because
Homozygous inversions are lethal and thus they do not appear in the next generation.
Inversion heterozygotes, i.e. one copy having normal chromosome and its homolog having inversion, does not allow crossing over to occur as they cannot pair at all.
Due to inversion present, four chromosomes take part in the pairing and crossing over events and make the structure difficult for separation and gamete formation.
The pairing and crossing overs do occur in inversion heterozygotes but the gametes having crossover products are lethal.
Answers (1)
Inversions are chromosomal rearrangements in which a segment of DNA is reversed or flipped within a chromosome. In inversion heterozygotes, where one homologous chromosome carries an inversion and the other does not, the pairing of homologous chromosomes during meiosis can result in the formation of inversion loop structures.
During crossing over in inversion heterozygotes, the chromosomes may align incorrectly within the inversion loop, leading to the formation of abnormal recombinant chromosomes. These recombinant chromosomes can contain duplications and deletions of genetic material, which can be detrimental or lethal to the organism.
As a result, the gametes carrying crossover products involving inversions are often nonviable or less fit compared to gametes without crossovers. This reduces the chances of successful recombination and offspring production, effectively suppressing crossovers within the inverted region. Therefore, inversions act as crossover suppressors or reduce recombination frequency within the inverted segment of the chromosome. Hence, the correct answer is option 4.
NEET 2024 Most scoring concepts
- Just Study 32% of the NEET syllabus and Score up to 100% marks
