29 Questions
What is the term for the conversion of germ cells into male and female gametes?
Gametogenesis
How many genes do humans have on 46 chromosomes?
Approximately 23,000
What is the name for the pairs of matching chromosomes in somatic cells?
Homologous pairs
What is the result of the sex pair being XY?
The individual is genetically male
What is the process by which germ cells undergo to reduce the number of chromosomes and complete their maturation?
Meiosis
What is the chromosome composition of each gamete?
Haploid number of 23 chromosomes
What is the process whereby one cell divides, giving rise to genetically identical daughter cells?
Mitosis
Which cell division takes place in the germ cells to generate male and female gametes?
Meiosis
What is the specific term for the process whereby oogonia differentiate into mature oocyte?
Oogenesis
Which period involves oogonia increasing in the ovary through mitotic division?
Period of multiplication
At what stage do primary oocytes enter meiosis I to produce secondary oocytes and first polar body?
Period of maturation
When does the total number of germ cells in the ovary reach its maximum during prenatal development?
Fifth month
What happens by the seventh month of prenatal development regarding the majority of oogonia in the ovary?
They degenerate and become atretic
"Chiasma" is formed during which stage of meiotic division involving homologous chromosomes?
[Crossover] to form chiasma
What happens during anaphase of the first meiotic division?
Double structured chromosomes pull apart
What is the term used for an organ that produces gametes such as testis or ovary?
Gonad
During which month of the fetal period does the size of the head become approximately 1/4th of the crown – heel length?
5th month
At what point during the fetal period does the transformation of embryo to fetus occur?
End of 9th week
What marks the beginning of the fetal form of external genitalia during the fetal period?
12th week
When do the legs become short and thighs small during the fetal period?
Beginning of 9th week
At what stage does the growth of the head constitute approximately 1/2 of crown – rump length (CRL) during the fetal period?
Beginning of 3rd month
During which week does the spleen become an important site of hematopoiesis?
28th week
At what stage do the intestinal loops withdraw into the abdominal cavity?
12th week
When do rapid eye movements begin in the fetus?
21st week
At what stage does the fetus respond to noise with blink-startle responses?
24th to 25th weeks
When is the site of hematopoiesis transferred from the liver to the spleen?
9th to 12th week
What happens during the 26th week of fetal development?
Hematopoiesis shifts to bone marrow
At what stage do the intestines cease to be in the umbilical cord?
11th week
When does the fetus reach a length of about 25cm and weigh approximately 1100gms?
6.5 to 7 months
Test your knowledge on the process of gametogenesis, which involves the conversion of primordial germ cells into male and female gametes through meiosis and cytodifferentiation. Understand the development of sperm and oocyte and their role in fertilization.
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