course hero which of the following is the result of nondisjuction of a sex chromosome?

What happens in nondisjunction of sex chromosomes?

In nondisjunction, the separation fails to occur causing both sister chromatids or homologous chromosomes to be pulled to one pole of the cell.

What is the result of nondisjunction?

Nondisjunction in meiosis can result in pregnancy loss or birth of a child with an extra chromosome in all cells, whereas nondisjunction in mitosis will result in mosaicism with two or more cell lines. Aneuploidy may also result from anaphase lag.

What are 4 common chromosomal abnormalities that result from nondisjunction?

Chromosomal Abnormalities Patau's Syndrome (trisomy 13) Edwards Syndrome (trisomy 18) Down Syndrome (trisomy 21) Klinefelter Syndrome (XXY)

What is meant by the nondisjunction of chromosomes?

Nondisjunction is defined as the failure of chromosomes or chromatids to segregate during cell division. It leads to daughter cells with abnormal numbers of chromosomes, which is known as aneuploidy.

Which of the following is caused by nondisjunction of chromosomes?

Hence the genetic disorder caused by a nondisjunction of chromosomes during meiosis is Klinefelter Syndrome. So, the correct answer is 'Klinefelter Syndrome'.

What are the 3 types of nondisjunction?

There are three forms of nondisjunction: failure of a pair of homologous chromosomes to separate in meiosis I, failure of sister chromatids to separate during meiosis II, and failure of sister chromatids to separate during mitosis.

What is a nondisjunction and why does it lead to chromosomal abnormalities quizlet?

Nondisjunction is a situation where a pair of homologous chromosomes fails to separate during meiosis I or meiosis II. Failure to separate causes aneuploidy which is a condition where a zygote will have an abnormal amount of chromosome.

How does nondisjunction cause chromosome number disorders quizlet?

How does nondisjunction cause chromosome number disorders? Chromosomes fail to separate, causing gametes to have abnormal numbers of chromosomes.

Which of the following may be the result of nondisjunction in the first meiotic division?

Nondisjunction in the first meiotic division. First division nondisjunction will only yield gametes with an extra chromosome, whereas second division nondisjunction will only yield gametes missing a chromosome.

What are examples of nondisjunction?

Examples of nondisjunction:Down syndrome.Triple-X syndrome.Klinefelter's Syndrome.Turner's Syndrome.

Is Down syndrome caused by nondisjunction in meiosis 1 or 2?

Trisomy 21 or Down syndrome (DS) is one of the most common chromosomal abnormalities. The majority of full trisomy 21 is caused by chromosomal nondisjunction occurring during maternal meiotic division (∼90%). Errors occur more frequently in the first maternal meiotic division than the second (73% vs.

What is a nondisjunction quizlet?

Nondisjunction. the failure of one or more pairs of homologous chromosomes or sister chromatids to separate normally during nuclear division, usually resulting in an abnormal distribution of chromosomes in the daughter nuclei. This is. Abnormal.

Does nondisjunction cause Down syndrome?

Down syndrome is caused by a random error in cell division that results in the presence of an extra copy of chromosome 21. The type of error is called nondisjunction (pronounced non-dis-JUHNGK-shuhn).

What is a nondisjunction quizlet?

Nondisjunction. the failure of one or more pairs of homologous chromosomes or sister chromatids to separate normally during nuclear division, usually resulting in an abnormal distribution of chromosomes in the daughter nuclei. This is. Abnormal.

Is Down syndrome caused by nondisjunction in meiosis 1 or 2?

Trisomy 21 or Down syndrome (DS) is one of the most common chromosomal abnormalities. The majority of full trisomy 21 is caused by chromosomal nondisjunction occurring during maternal meiotic division (∼90%). Errors occur more frequently in the first maternal meiotic division than the second (73% vs.

What are some examples of nondisjunction?

Examples of nondisjunction:Down syndrome.Triple-X syndrome.Klinefelter's Syndrome.Turner's Syndrome.