What is the structure that holds the chromatids together quizlet?
What is the structure that holds the chromatids together quizlet?
centromere
What molecule holds sister chromatids together?
Cohesin
How are chromatids held together?
The two identical chromosomes that result from DNA replication are referred to as sister chromatids. Sister chromatids are held together by proteins at a region of the chromosome called the centromere. Chromosomes undergo additional compaction at the beginning of mitosis.
What will happen if sister chromatids fail to separate during anaphase II?
When nondisjunction occurs in meiosis II, cells divide normally during anaphase I (homologous chromosomes separate correctly), but sister chromatids fail to separate during anaphase II (as seen in the diagram above, on the left). This again results in four possible haploid gametes.
What would happen if the sister chromatids failed to separate quizlet?
What would happen if one pair of sister chromatids failed to split during mitosis? One daughter cell would have one chromosome too many and the other daughter cell would have one chromosome too few. During meiosis, segments of non-sister chromatids can exchange.
How does a gamete end up with an extra chromosome?
When a sperm fertilizes an egg, the union leads to a baby with 46 chromosomes. But if meiosis doesn’t happen normally, a baby may have an extra chromosome (trisomy), or have a missing chromosome (monosomy). These problems can cause pregnancy loss. Or they can cause health problems in a child.
Can you have an extra chromosome and be normal?
Most commonly, some cells end up with one extra or missing chromosome (for a total of 45 or 47 chromosomes per cell), while other cells have the usual 46 chromosomes. Mosaic Turner syndrome is one example of chromosomal mosaicism.
What does it mean if you have an extra chromosome?
A trisomy is a chromosomal condition characterised by an additional chromosome. A person with a trisomy has 47 chromosomes instead of 46. Down syndrome, Edward syndrome and Patau syndrome are the most common forms of trisomy.
What are the chances of having a baby with a chromosomal abnormality?
What are the chances of your baby having a chromosomal condition? As you get older, there’s a greater chance of having a baby with certain chromosomal conditions, like Down syndrome. For example, at age 35, your chances of having a baby with a chromosomal condition are 1 in 192. At age 40, your chances are 1 in 66.