What are the two meiotic events that contribute to genetic diversity in a population?
What are the two meiotic events that contribute to genetic diversity in a population?
There are two ways meiosis causes genetic diversity:
- recombination in prophase (meiosis I)
- reducing the number of chromosomes to half.
How can recombination during meiosis be explained?
How can recombination during meiosis be explained? Crossing over provides a mechanism for genetic recombination during meiosis. Genes that are closer together on a chromosome will result in less crossing over and more non-crossing over. Genes that are farther apart on a chromosome will experience more crossing over.
What is recombination and why is it important?
Beyond its role in meiosis, recombination is important to somatic cells in eukaryotes because it can be used to help repair broken DNA, even when the break involves both strands of the double helix. Then, once synthesized, this new DNA can be incorporated into the broken DNA strand, thereby repairing it.
What is an example of genetic recombination?
General or homologous recombination occurs between DNA molecules of very similar sequence, such as homologous chromosomes in diploid organisms. Good examples are the systems for integration of some bacteriophage, such as l, into a bacterial chromosome and the rearrangement of immunoglobulin genes in vertebrate animals.
What are three ways in which genetic recombination results during meiosis?
We have seen that meiosis creates variation three ways: crossing over, mutations caused during crossing over, and independent assortment.
Which of the following is an example of site specific recombination?
8. Which of the following is an example of site specific recombination? Explanation: The phage particles attach to the bacterial genome using site-specific recombination reaction. Explanation: Excision of the genome of lamda phage from the bacterial genome requires IHF and XIS that is coded by the bacteriophage.
Where does site specific recombination occur?
Homologous recombination vs. site-specific recombination: Homologous recombination occurs between DNA with extensive sequence homology anywhere within the homology. Site-specific recombination occurs between DNA with no extensive homology (although very short regions may be critical) only at special sites.
What is conservative site specific recombination?
Conservative site-specific recombination is a process that enables genetic recombination between DNA molecules that contain short DNA sequences, which are bound by specific recombinase proteins.
Which enzyme is necessary for the movement of mobile genetic elements?
Figure 5-69. Three of the many types of mobile genetic elements found in bacteria. Each of these DNA elements contains a gene that encodes a transposase, an enzyme that conducts at least some of the DNA breakage and joining reactions needed for the element to move.