April 6 (UPI) --Boys face a greater risk of respiratory problems, including asthma, later in life because they have only one gender-based X chromosome, according to a study, leading to possible ...

DEAR DR. DONOHUE: Our granddaughter is 8 years old and small for her age. She has been tested for a number of things, but all tests have come back without indicating what could be wrong. She is ...

Sex chromosomes, chromosomes responsible for determining if a mammal is male or female, may have evolved to reduce “sexual ...

As illustrated in Table 1, the somatic cells from Type A males had one less chromosome than the somatic cells of females of the same species. In the Type B species, however, the chromosome number ...

When You've Doubled Your Genes, What's One Chromosome More Or Less? How Polyploidy And Genomic Change Can Lead To Evolutionary Change Date: September 15, 2009 ...

Scientists in Japan have used gene-editing technology to remove the extra chromosome responsible for Down syndrome, at least ...

Human biological sex is determined by the sex chromosomes X and Y. In most cases, females possess two X chromosomes, while males have one X and one Y. However, there is some evidence that the Y ...

The Y chromosome can disappear over time in human males, which may introduce a number of health problems. While the exact trigger for such degeneration is unknown, environmental factors can play a ...

The male Y chromosome has disappeared from a species of rat, leading scientists to investigate how humans might also lose ours in the near future.. It's not all bad news for men though, as a paper ...