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HomeHomework HelpbiologyCrossing Over and Recombination

Crossing Over and Recombination

Crossing over is the process during meiosis where homologous chromosomes exchange segments of genetic material, leading to genetic recombination. Recombination increases genetic diversity in offspring by producing new allele combinations.

intermediate
2 hours
Biology
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Overview

Crossing over and recombination are essential processes in genetics that occur during meiosis, leading to genetic diversity in offspring. By exchanging segments of DNA between homologous chromosomes, these processes create new combinations of alleles, which are crucial for evolution and adaptation. ...

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Key Terms

Meiosis
A type of cell division that reduces the chromosome number by half, producing gametes.

Example: Meiosis occurs in the formation of sperm and egg cells.

Homologous chromosomes
Pairs of chromosomes that have the same structure and gene sequence, one from each parent.

Example: Humans have 23 pairs of homologous chromosomes.

Chiasmata
The points where two homologous chromosomes exchange genetic material during crossing over.

Example: Chiasmata are visible under a microscope during prophase I.

Alleles
Different versions of a gene that can exist at a specific locus on a chromosome.

Example: The gene for flower color may have a red allele and a white allele.

Genetic variation
Differences in DNA sequences among individuals, contributing to diversity in a population.

Example: Genetic variation is essential for evolution.

Gametes
Reproductive cells (sperm and eggs) that carry half the genetic information of an organism.

Example: Gametes are produced through meiosis.

Related Topics

Genetic Engineering
The manipulation of an organism's genes to achieve desired traits.
advanced
Population Genetics
The study of genetic variation within populations and how it changes over time.
intermediate
Evolutionary Biology
The study of the processes that drive the evolution of species.
advanced

Key Concepts

MeiosisHomologous chromosomesGenetic variationAlleles