A chromosome pair, as in a pair of Chromosome 15, or a pair of Chromosome 5. Others have said Tetrad - Pls stand-by.
sister chromatids (after DNA replication, but before dividing)
A single crossover of homologous chromosomes results in two chromatids that have recombined genetic material from both parents. This means that two of the chromatids will have segments from one homologous chromosome, while the other two will retain the original segments from the other homolog. Therefore, the set of chromatids illustrating this result will show two chromatids with new combinations of alleles and two chromatids with the parental combinations.
is it two chromatids or spindles
The cell structure that joins two sister chromatids into one single chromosome is called the centromere. This is at the center of the sister chromatids.
1 centromere for every pair of chromatids
tetrad
tetrad
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tetrad
sister chromatids (after DNA replication, but before dividing)
Tetrad
tetrad
tetrad
A tetrad consists of two homologous chromosomes, each composed of two sister chromatids. This results in a total of four chromatids aligned during meiosis, allowing for genetic recombination between the homologous chromosomes.