Meiosis and Chromosome abnormalities Flashcards
How many cells are produced in meiosis?
4
When does crossing over occur?
In the first mitosis in meiosis
Why is there more likely to be mutations in sperm cells rather than egg cells?
Because sperm cells undergo many more divisions than egg cells do during development
What is spermatogenesis?
The formation of 4 sperm cells
What is oogenesis?
The formation of an egg cell
What is a trisomy 21 and what does it cause?
3 number 21 chromosomes, Down’s Syndrome `
What does a trisomy 13 cause?
Patau Syndrome- Few survive very long, dysmorphic features
What does a trisomy 18 cause?
Edward’s Syndrome-most die within first year
What is Turner’s Syndrome?
Only one X chromosome. Infertile and Neck Webbing
What is Klinefelter’s Syndrome?
XXY chromosomes. Infertiles, small testes, very tall.
What kind of chromosomes can go through a Robertsonian translocation?
Acrocentric chromosomes
