Meiosis Flashcards
failure of separation in meiosis I or meiosis II results in gametes with one extra chromosome and other gametes lacking a chromosome.
non-disjunction
Meiosis consists of how many divisions?
2
Meiosis in spermatogenesis results in how many haploid sperm?
4
Meiosis in oogenesis results in how many haploid ovum?
1
In oogenesis, the primary oocyte has how many chromosome number?
2n
In oogenesis, the secondary oocyte has how many chromosome number?
n
In oogenesis the primary oocyte is arrested in
Prophase I of Meiosis I
In oogenesis the primary oocyte completes MI after
ovulation
In oogenesis the secondary oocyte arrested in
Metaphase II of Meiosis II
In oogenesis the secondary oocyte completes Meiosis II
fertilization
The products of oogenesis are
2nd polar body and 1 ovum
In spermatogenesis the primary spermatocyte has ____ chromosome number
2n
In spermatogenesis the secondary spermatocyte has ___ chromosome number
n
-Stem sperm cells undergo mitosis then ___
Meiosis
put in correct order: sperm, spermatogonium, secondary spermatocyte, Primary spermatocyte
Spermatogonium< Primary spermatocyte< Secondary spermatocyte< sperm
In spermatogenesis how may chromosome and chromatids (actual number) in a spermatogonium?
46 chromosomes, 92 chromatids (46 x 2 = 92)
In spermatogenesis how may chromosome (actual number) in a primary spermatocyte?
46 chromosomes, 92 chromatids (46 x 2 = 92)
In spermatogenesis how may chromosome (actual number) in a secondary spermatocyte?
23 chromosome, 46 chromatids (23 x 2 = 46)
In oogenesis how many chromosomes and chromatids (actual number) does a oogonium have?
46 chromosomes, 92 chromatids (46 x 2 = 92)
In oogenesis how many chromosomes and chromatids (actual number) primary oocyte have?
46 chromosomes, 92 chromatids (46 x 2 = 92)
In oogenesis how many chromosomes and chromatids (actual number) secondary oocyte have?
23 chromosome, 46 chromatids (23 x 2 = 46)
separation of homologous chromosomes
Meiosis I
separation of chromosomes in Meiosis occurs at
Anaphase II in Meiosis II
non-disjunction in Meiosis I is catastrophic because it results in…
2 trisomies and 2 monosomies
Trisomy ( 3 chromosomes one cell) : small chance of survival - down syndrome
Monosomy: (lack 1 chromosome therefore only have one chromosome from either mother or father)- fatal
non-disjunction in Meiosis II will result in …
1 trisomy, 1 monosomy, and 2 normal
