Introduction To Embryology And Gametogenesis Flashcards
The process where one diploid germ cell divides to create either 1 or 4 haploid cell is known as
Meiosis
Genetic diversity is produces as a result of
Crossing over
Which hormone induces the proliferation of the follicular cells in females
FSH
Spermatids are gradually transformed into mature sperms by a process known as
Spermiogenesis
At the time of ovulation the oocyte enters which of the following stages of second meitoic division ?
Metaphase
A process of sperm conditioning in which glycoproteins and seminal proteins are removed from the sperm acrosomal surface.
Acrosomal reaction
One spermatogonium after undergoing spermatogenesis gives rises to ……. Sperms
4
The developing individual is referred as an embryo during
The first 8 weeks
Who was the first test tube baby?
Louise brown
Two features seen in a secondary oocyte in the metaphase stage of second meitoic division.
Theca interna and theca externa
Approx one and a half days before the midpoint of menstrual cycle in females which hormone is secreted?
LH
The dominant follicle in one of the two ovaries reaches a diameter of up to 25mm and is known as
Graffian follicle
The largest cell nuclei in the germinal epithelium is possessed by
Primary spermatocytes
What is the human embryo called at beginning of development ?
Zygote
Conceptus
Is used when referring to an embryo and is extra embryonic membranes
Totipotent
The ability of a single cell to divide and produce all the differentiated cells in an organism
Trimester
A period of 3 onths
Abortion
A premature stoppage of development and expulsion of the conceptus from uterus or expulsion of embryo or fetus before it is viable capable of living outside the uterus .
Pre embryonic
First 2 weeks includes cleavage, implantation
Embryonic period
3rd to 8th week
Fetal
3rd to 9 th week
Perinatal
22 weeks to birth
First test tube baby
Louise brown
Gametes
Haploid reproductive cells e.g sperm ovum
Meiosis
Process by which one diploid germ cell divides in order to create either 1 or 4 haploid cells.
Spermatogenesis
The sequence of events by which spermatogonia are transformed into mature sperm in the seminiferous tubules of testis.
Primary spermatocytes
Diploid cells resulting from differentiation of type b spermatogonia they enter meiosis 1
Secondary spermatocytes
Haploid cells resulting from meiosis 1 during spermatogenesis
Spermeogenesis
Differentiation of spermatids to spermatozoa. It includes the addition of an acrosome with enzymes and a flagellum for locomotion at the tail region.
Four events in spermeogeneis
Reduction in nuclear size
Loss of cytoplasm
Condensation of Golgi
Spiral arrangement of mitochondria
The cycle of spermatogonia last
64 days
The secondary spermatocytes enter which cell division
Meiosis 2
