Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
10 Cards in this Set
- Front
- Back
|
What is a nondisjunction?
|
An accident in meiosis in which the members of a chromosome pair fail to separate
|
|
|
Does nondisjunction occur in Meiosis 1 or Meiosis 2?
|
Both
|
|
|
What happens if a pair of homologous chromosomes don't seperate in Meiosis 1?
|
All the resulting gametes end up with abnormal chromosome numbers
|
|
|
What would happen if an egg cell with two copies of one of its chromosomes was fertilized by a normal sperm cell?
|
Mitosis would transmit the abnormality to all embryonic cells
|
|
|
Can nondisjunction occur in either sex?
|
Yes
|
|
|
About what percent of children born from an abnormal gamete would have disorders?
|
50%
|
|
|
What causes nondisjunction?
|
It is unknown for sure
|
|
|
When does meiosis begin in a woman's ovaries?
|
Before she is born
|
|
|
When is meiosis completed in a woman's ovaries?
|
At the time of an ovulation, much later
|
|
|
How many egg cells usually mature each month?
|
1
|
