Embryology test 1 (P. 1-15) QUESTIONS WITH WELL VERIFIED
ANSWERS
What does prenatal mean?
before birth
What does postnatal mean?
after birth
What does perinatal mean?
during birth (3rd trimester through 1st month
When does fertilization occur?
0-2 weeks in utero
What period is 3-8 weeks in utero?
Embryonic period
When does the fetal period occur?
9-38 weeks
When is infancy?
birth to 1 year
When is adolescence?
puberty to adulthood
When is adulthood?
18-21 years
What is an infant called in the first month after birth?
Neonate
When is the greatest sensitivity to teratogenesis?
Embryonic period (3-8 weeks)
What dies caudal mean in an embryo?
Inferior
, human development begins when?
when the male and female gametes form a zygote
what is the process that results in the production of gametes?
gametogenesis
gametogenesis uses?
Meiosis
How many chromosomes are involved with mitosis?
46 (diploid)
How many chromosomes are involved with meiosis?
23 (haploid)
chromosomes consist of what following DNA synthesis?
Two chromatids
What happens in the first meiotic division?
paired homologous chromosomes separate into two daughter cells, each with two chromatids
What happens in the second meiotic division?
each chromosome splits at the centromere into two separate chromatids, each goes to a
separate daughter cell
what enhances genetic variability?
1. random assortment of homologous chromosomes
2. crossover (chiasma)
3. novel combination of gametes
What is the chiasma?
temporary connection during crossover
When is the diploid number restored?
fertilization
What is the failure of a pair of chromosomes to split during meiosis?
ANSWERS
What does prenatal mean?
before birth
What does postnatal mean?
after birth
What does perinatal mean?
during birth (3rd trimester through 1st month
When does fertilization occur?
0-2 weeks in utero
What period is 3-8 weeks in utero?
Embryonic period
When does the fetal period occur?
9-38 weeks
When is infancy?
birth to 1 year
When is adolescence?
puberty to adulthood
When is adulthood?
18-21 years
What is an infant called in the first month after birth?
Neonate
When is the greatest sensitivity to teratogenesis?
Embryonic period (3-8 weeks)
What dies caudal mean in an embryo?
Inferior
, human development begins when?
when the male and female gametes form a zygote
what is the process that results in the production of gametes?
gametogenesis
gametogenesis uses?
Meiosis
How many chromosomes are involved with mitosis?
46 (diploid)
How many chromosomes are involved with meiosis?
23 (haploid)
chromosomes consist of what following DNA synthesis?
Two chromatids
What happens in the first meiotic division?
paired homologous chromosomes separate into two daughter cells, each with two chromatids
What happens in the second meiotic division?
each chromosome splits at the centromere into two separate chromatids, each goes to a
separate daughter cell
what enhances genetic variability?
1. random assortment of homologous chromosomes
2. crossover (chiasma)
3. novel combination of gametes
What is the chiasma?
temporary connection during crossover
When is the diploid number restored?
fertilization
What is the failure of a pair of chromosomes to split during meiosis?
