Sentences with phrase «pair of chromosomes more»

Both sex chromosomes evolved from an ordinary pair of chromosomes more than 200 million years ago (Science, 29 October, 1999, p. 964).

Not exact matches

The most common cause of first - trimester miscarriages is chromosomal abnormalities in the baby, especially trisomy (three copies of one or more of the 23 chromosome pairs).

When they looked more closely, they found that a 1.5 - million - base - pair sequence was duplicated on one copy of chromosome 17.

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.

As science looks more closely, however, it becomes increasingly clear that a pair of chromosomes do not always suffice to distinguish girl / boy — either from the standpoint of sex (biological traits) or of gender (social identity).

Thirty - three of 40 pairs of gay brothers the researchers studied inherited the same version of this chromosome region — significantly more than the 20 pairs (half) expected by chance (This Week, 24 July 1993).

Defective genes can be caused by mutations in either the maternally - inherited mitochondrial genome (mtDNA) or more frequently, the genes located on the autosomes, the 23 pairs of chromosomes which are responsible for all traits and all other genetic diseases.

Several other technical advances helped, including the development of huge yeast artificial chromosomes, so - called «megaYACs», which can store up to 1.4 million pairs of DNA in one big chunk — 35 times more than can be stored in bacteria, the conventional way to clone DNA.

The evidence suggests it does: 249 pairs of siblings were more likely to both have diabetes, or both be healthy, if they shared the same set of genetic markers in the region of the IL - 12 gene on chromosome 5.

It arises from the deletion of no more than 20 genes from one chromosome of the seventh chromosome pair.

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.

They have one more pair of chromosomes.

39andMe Several companies provide a test like «23andMe» for dogs, except dogs have 39 pairs of chromosomes — 16 more pairs than we do!