Which process occurs during prophase I and involves the exchange of DNA between homologous chromosomes?

What process occurs in prophase I?

Explanation: During prophase I, homologous chromosomes pair with each other and exchange genetic material in a process called chromosomal crossover. The exchange occurs in segments over a small region of homology (similarity in sequence, ie., the same alleles).

What is the process called during prophase I where homologous chromosomes exchange genes?

Recombination in meiosis. Recombination occurs when two molecules of DNA exchange pieces of their genetic material with each other. One of the most notable examples of recombination takes place during meiosis (specifically, during prophase I), when homologous chromosomes line up in pairs and swap segments of DNA.

What happened during prophase 1?

During prophase I, homologous chromosomes pair and form synapses, a step unique to meiosis. The paired chromosomes are called bivalents, and the formation of chiasmata caused by genetic recombination becomes apparent. Chromosomal condensation allows these to be viewed in the microscope.

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What happens during prophase I of meiosis quizlet?

What happens during prophase I of meiosis? Homologous chromosomes form and crossing over occurs between them. … -Meiosis produces four genetically different haploid cells. -Genetic material is exchanged between homologous chromosomes in meiosis during crossing over.

What process occurs in prophase 1 of meiosis makes every gamete different?

What makes every gamete different in prophase 1 is that crossing over occurs, meaning a part of each chromosome switches to the other.

Which of the following happens during prophase I of meiosis?

During prophase I, the complex of DNA and protein known as chromatin condenses to form chromosomes. The pairs of replicated chromosomes are known as sister chromatids, and they remain joined at a central point called the centromere.

During which stage of prophase I does crossing over take place?

During which stage of prophase I does crossing over take place? Pachynema; Crossing over occurs during pachynema when bivalents are closely paired. A tetrad is composed of one pair of homologous chromosomes at synapsis of prophase I.

What happens as homologous chromosomes pair up during prophase 1 of meiosis?

During prophase I, the homologous chromosomes condense and become visible as the x shape we know, pair up to form a tetrad, and exchange genetic material by crossing over. … In metaphase I, the tetrads line themselves up at the metaphase plate and homologous pairs orient themselves randomly.

What do you call the pairing of homologous chromosomes in prophase I?

Prophase I

The tight pairing of the homologous chromosomes is called synapsis. In synapsis, the genes on the chromatids of the homologous chromosomes are aligned with each other.

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During which one of the following stages of prophase I of meiosis do the sites of crossing over become clearly visible under the microscope?

Diakinesis. Diakinesis is the final step of Prophase 1 and is the termination of the condensing of the chromosomes, this allows the chiasmata and bivalent structure to be seen more clearly under an electron microscope.