L1-Genetics Flashcards
What are the two words to say away from in Genetics?
Never and Always
Which phase is the chromosome its most condensed (what phase are they looking at in a karyotype)?
Metaphase
What are the three “shapes”/positions of the centromere of a chromosome?
Metacentric, Submetacentric, and Acrocentric
What is on the telomere of the acrocentric chromosome?
rRNA
What 2 phases surround G1?
Mitosis(or meiosis)—>G1—->Synthesis
What 2 phases surround G2?
Synthesis—>G2—>Mitosis
What are the special steps in the cell cycle that help restrict cell division?
CHECKPOINTS
What phase does the nuclear membrane disappear?
pro-metaphase
What separates in MI?
Homologous chromosomes
When does crossing over occur? What can be the result of decreased number of crossovers?
M1…non-disjunction
What is the product of complete oogenesis? 1 ovum = how many polar bodies??
1 ovum=2 polar bodies
Male Vs Female Meiosis: Male Commences
POOberty
Male Vs Female Meiosis: Female Commences
Early Embryonic Life
Male Vs Female Meiosis: Male Duration
60-65 days
Male Vs Female Meiosis: Female Duration
10-50 yrs (only after complete fertilization)
Male Vs Female Meiosis: Male Gametes/meiosis
4 spermatids
Male Vs Female Meiosis: Female gametes/meiosis
1 ovum and 2 polar bodies
Male Vs Female Meiosis: Male Gamete production
100-200 million/ejactulate
Male Vs Female Meiosis: Female gamete production
1 ovum/cycle
What is the difference between non-disjunction at MI and MII?
MI=HETERSOMY (sisterchromatids separated) and MII=ISODISOMY (sister chromatids did not separate)
After meiosis II, the daughter cells have how many chromosomes and how many chromatids?
23,23
