What Are Attached At The Centromere? Sister Chromatids Are Joined Together at Centromeres In addition to their kinetochore-related function, centromeres perform another essential role in mitosis by serving as the sites of sister chromatid cohesion. For accurate mitoses, sister chromatids must remain attached until the spindle checkpoint has been passed. Where are the centromeres attached?
Does Down Syndrome Have A Genotype? Down syndrome (DS) is one of the most frequent congenital birth defects, and the most common genetic cause of mental retardation. In most cases, DS results from the presence of an extra copy of chromosome 21. DS has a complex phenotype, and a major goal of DS research is
What Best Describes Traits That Are Found On The X Chromosome But Not On The Y Chromosome? X-linked genes When a gene is present on the X chromosome, but not on the Y chromosome, it is said to be X-linked. X-linked genes have different inheritance patterns than genes on non-sex chromosomes (autosomes). That’s because these
Why Heterochromatin Is Genetically Inactive? The two types of chromatin, heterochromatin and euchromatin, are functionally and structurally distinct regions of the genome. Heterochromatin is densely packed and inaccessible to transcription factors so it is rendered transcriptionally silent (Richards and Elgin 2002). Is heterochromatin genetically inactive? Heterochromatin mainly consists of genetically inactive satellite sequences, and many
Are Males XY Or YY? Typically, biologically male individuals have one X and one Y chromosome (XY) while those who are biologically female have two X chromosomes. Can males have YY? Males with XYY syndrome have 47 chromosomes because of the extra Y chromosome. This condition is also sometimes called Jacob’s syndrome, XYY karyotype, or
Why Are Some Genes Known As Sex Linked Genes? Sex linked is a trait in which a gene is located on a sex chromosome. In humans, the term generally refers to traits that are influenced by genes on the X chromosome. This is because the X chromosome is large and contains many more genes than
Which Parent Carries The Down Syndrome Gene? The genetic basis of Down syndrome Half the chromosomes come from the egg (the mother) and half come from the sperm (the father). Is Down syndrome comes from mother or father? There is no definitive scientific research that indicates that Down syndrome is caused by environmental factors or
Why Are Chromosomes Not Visible In Most Cells? Each chromosome contains a few thousand genes, which range in size from a few thousand bases up to 2 million bases. During most of the cell cycle, interphase, the chromosomes are somewhat less condensed and are not visible as individual objects under the light microscope. Why are
What Is The Current Research For Down Syndrome? Researchers at CHU Sainte-Justine and Université de Montréal have discovered a new mechanism involved in the expression of Down syndrome, one of the main causes of intellectual disability and congenital heart defects in children. The study’s findings were published today in Current Biology. What research is being
What Is Klinefelter Syndrome In Biology? Overview. Klinefelter syndrome is a genetic condition that results when a boy is born with an extra copy of the X chromosome. Klinefelter syndrome is a genetic condition affecting males, and it often isn’t diagnosed until adulthood. What is meant by Klinefelter syndrome? Listen to pronunciation. (KLINE-fel-ter SIN-drome) A