During what stage of meiosis do new allele combinations form?
When the homologous chromosomes are later pulled apart during anaphase I, each chromosome carries new, unique allele combinations that are a direct result of recombination.
How are new combinations of alleles produced in meiosis?
Recombination is a process by which pieces of DNA are broken and recombined to produce new combinations of alleles. … In eukaryotic cells, which are cells with a nucleus and organelles, recombination typically occurs during meiosis.
Which parts of meiosis result in novel combinations of alleles?
When homologous chromosomes form pairs during prophase I of meiosis I, crossing-over can occur. Crossing-over is the exchange of genetic material between homologous chromosomes. It results in new combinations of genes on each chromosome.
During which stage might new DNA combinations form on chromosomes quizlet?
Crossing over in prophase I results in entirely new chromosome combinations, as recombination through gene exchange produces wholly original chromosomes containing both maternal and paternal DNA, resulting in near infinite genetic variability.
How does meiosis produce genetic variation?
During meiosis, homologous chromosomes (1 from each parent) pair along their lengths. The chromosomes cross over at points called chiasma. At each chiasma, the chromosomes break and rejoin, trading some of their genes. This recombination results in genetic variation.
What are two ways that meiosis produces genetic variation?
- Crossing over (in prophase I)
- Random assortment of chromosomes (in metaphase I)
- Random fusion of gametes from different parents.
How many combinations can arise meiosis?
= 256 different combinations.
What leads to novel combinations of alleles?
Explanation: When chromatids “cross over,” homologous chromosomes trade pieces of genetic material, resulting in novel combinations of alleles, though the same genes are still present. Crossing over occurs during prophase I of meiosis before tetrads are aligned along the equator in metaphase I.
Which three events cause new combinations of alleles in offspring?
Genetic variation can be caused by mutation (which can create entirely new alleles in a population), random mating, random fertilization, and recombination between homologous chromosomes during meiosis (which reshuffles alleles within an organism’s offspring).