Mod 5.1 Fetal Embryology Definitions Flashcards
What is a Haploid?
A single set of unpaired chromosomes (23)
If we have a haploid with 46 chromosomes it does what?
Divides into 2 new cells, each with 23 chromosomes
What is a diploid?
Paired chromosomes
How many chromosomes does a diploid have?
46 chromosomes
What is a triploid?
3 complete chromosome sets (69 chromosomes)
What is a trisomy?
A condition where there is one extra chromosomes present in each cell additional to the normal diploid
Trisomy 21 means what?
An extra chromosome on chromosome 21 (Down syndrome)
For trisomy karyotypes are now what?
47xx or xy
Karyotypes is how chromosomes are what?
Expressed
What is mitosis?
Process of nuclear division where cellular material is equally divided between both daughter cells
**All cells except gamete cells (sex cells) **
What is meiosis?
The process that reduces the number of chromosomes in gametes to half (haploid)
What is a chromosome?
A threadlike nucleoprotein structure within the nucleus of a cell that contains DNA
What is DNA?
A double standard nuclei acid that is a constituent of chromosomes
What does DNA contains?
contains hereditary information coded in specific sequences
What is a gene?
A hereditary unit that carries hereditary traits