Nondisjunction (sex chromosomes)

Question 1

When can nondisjunction happen and why?

Answer 1

When homologous pairs fail to separate during anaphase I or sister chromatids fail to separate during anaphase II

Question 2

Aneuploidy

Answer 2

Abnormal number of chromosomes

Question 3

What can nondisjunction create is human gametes?

Answer 3

Gametes with 22 or 24 chromosomes, which is one more or one less than the normal amount

Question 4

Monosomy

Answer 4

The zygote has a single chromosome in place of a homologous pair

Question 5

Trisomy

Answer 5

Zygote will have three chromosomes in place of the normal pair

Question 6

Turner Syndrome

Answer 6

Only one X chromosome , so the female has 45 chromosomes. Most monosomic disorders can be lethal, but there can be individuals with Turner Syndrome

Question 7

Klinefelter Syndrome

Answer 7

Males carries XXY chromosomes, which makes them sterile and have a high amount of the female sex hormones

Question 8

XYY Males

Answer 8

These males may be taller than average

Question 9

XXX

Answer 9

Very rare and can’t be distinguished unless a karyotype is done.