Sentences with phrase «single pairs of chromosomes»

In the second stage of meiosis, the single pairs of chromosomes — two sister chromatids joined in the middle — separate and the egg cell divides again in the same way, leaving a single mature egg cell with one copy of each chromosome.

Not exact matches

Reviewing thousands of genome wide associate studies (GWAS) to identify genetic variants in single nucleotide polymorphisms (SNPs), investigators at Dartmouth's Norris Cotton Cancer Center found that some alleles (one of a pair of genes located on a specific chromosome) are more frequently risk - associated with disease than protective.

These groups of four chromosomes — called bivalents — then split apart into single pairs, and the cell divides.

Forms of variation include single DNA base pair alterations, duplications or deletions of genes or sets of genes, and translocations, a chromosomal rearrangement in which a segment of genetic material from one chromosome becomes heritably linked to another chromosome.

In the first paper, utilizing genomic analysis of nearly 8,500 Icelandic and Dutch participants, the deCODE team identified a novel, tightly - linked pair of single - letter variants (SNPs) near the ASIP (agouti signaling protein) gene on chromosome 20 that greatly increase the likelihood of an individual being prone to freckles and sunburn.

In addition to the large CNV mutations they had spotted earlier, they also found de novo changes in single base pairs of DNA — known as single - nucleotide variants (SNVs)-- and small de novo insertions or deletions in chromosomes, all of which made the picture even more complex.