Crossing over results the exchange of genetic material, which occurs betweena)Non-sister chromosomesb)Sister chromatidsc)Non-homologous chromosomed)Homologous chromosomesCorrect answer is option 'D'. Can you explain this answer?

Question

Answer

Most organisms that undergo sexual reproduction contain two types of cells in their body – haploid and diploid cells. Diploid cells are seen in most parts of the body and contain two copies of every chromosome. Therefore, they contain two genes to determine the sequence of nearly every RNA or protein. Haploid cells are usually male or female gametes formed as a result of meiosis and are seen in sexual organs. They contain only one complete set of chromosomes and are designed to fuse with another haploid gamete to produce a diploid zygote – with one paternal and one maternal set of chromosomes. Though they code for the same genes, their DNA sequences can vary slightly from one another. For instance, the paternal chromosome may contain the genetic information to result in antigen A being present on red blood cells, while the maternal chromosome may code for antigen B. These two antigens are similar in function, but differ from each other marginally in their amino acid sequence.

Answer

Complete answer is non sister chromatids of homologus chromosome.

Answer

Crossing over results theexchange of genetic material between to homologous chromosomes during meiosis I of cell division

Answer

The word homo means equal. So from the name, we can understand that the chromosomes, which exchange there genetic matirials r equal in shape. ND we also know that, the homologous chromosomes bivalant, so that they can exchange there genetic materials. unequal chromosomes can't bivalant with each other. so they can't exchange there genetic material. so it is only the homologous chromosome which can exchange it's genetic material.

Answer

Explanation:
Crossing over is a process that occurs during meiosis, specifically during prophase I. It involves the exchange of genetic material between homologous chromosomes. The correct answer is option 'D' because crossing over occurs between homologous chromosomes.

Homologous Chromosomes:
Homologous chromosomes are a pair of chromosomes that have the same genes at the same loci, although they may have different alleles. During crossing over, genetic material is exchanged between these homologous chromosomes.

Process of Crossing Over:
1. Homologous chromosomes pair up and form a structure called a bivalent or tetrad.
2. The non-sister chromatids of homologous chromosomes exchange sections of genetic material.
3. This exchange occurs at specific points called chiasmata, where the chromosomes physically cross over each other.
4. The exchange of genetic material results in the recombination of alleles between homologous chromosomes.
5. After crossing over, each chromosome contains a combination of genetic material from both of the original homologous chromosomes.

Importance of Crossing Over:
Crossing over is an important event in meiosis because it increases genetic diversity. It results in the shuffling of genetic material and the creation of new combinations of alleles. This genetic variation is essential for the survival and adaptation of species.

Significance in Evolution:
Crossing over plays a crucial role in evolution. It leads to the production of genetically diverse gametes, which increases the chances of offspring having advantageous traits. This genetic variability allows populations to adapt to changing environments and increases the overall fitness of a species.

Conclusion:
In summary, crossing over occurs between homologous chromosomes during meiosis. It results in the exchange of genetic material, leading to genetic recombination and increased genetic diversity. Understanding the process of crossing over is essential for comprehending the mechanisms of genetic inheritance and evolution.

Answer

According to the NCERT text,
The sites at which crossing over occurs between non-sister chromatids of the homologous chromosomes

Answer

Why not A?

Answer

Crossing over occurs during prophase I of meiosis before tetrads are aligned along the equator in metaphase I. By meiosis II, only sister chromatids remain and homologous chromosomes have been moved to separate cells. Recall that the point ofcrossing over is to increase genetic diversity...

Hope it will help !!

Similar NEET Doubts

Crossing over results in the exchange of genetic material, which occurs between

Crossing over occurs between

During meiosis, crossover occurs between

Plz explain what are sister chromatids, non-sister chromatids, sister chromosomes and homologous chromosomes?

In diploid cells,each homologous chromosome consists of

Top Courses for NEETView all

Biology Class 11

Daily Test for NEET Preparation

NEET Mock Test Series 2025

Topic-wise MCQ Tests for NEET

DPP: Daily Practice Problems for NEET

Top Courses for NEET

Top Courses for NEET

Related Content

About NEET

NEET Preparation Material

How to Prepare for NEET Exam?

NCERT Based Study Material

NEET Mock Tests

Other Popular Exams

Company