Week 3 Exam 1

Question 1

Genome

Answer 1

an organisms complete set of instructions, all the genetic info needed for development, stored in DNA

Question 2

Genotype

Answer 2

o An individual’s inherited genetic makeup

Question 3

Phenotype

Answer 3

o The individual’s appearance and behavior, shaped in part by genotype

Question 4

Zygote

Answer 4

o Germinal period: first 14 days
o Zygote begins duplication and division within hours of conception
 Development of the placenta
 Implantation (10 days after conception)
 Organism grows rapidly
 Sperm and egg fuse

Question 5

Embryo

Answer 5

o Embryonic period: third through eighth week
o Primitive streak becomes the neural tube and later forms the brain and spine of CNS
o Head takes shape
o Eyes, ears, nose, and mouth form
o Heart begins to pulsate
o Extremities develop and webbed fingers and toes separate

Question 6

Fetus

Answer 6

o Fetal period: ninth week until birth
 Fetus
* Genitals form and sex hormones cause differences in fetal brain organization
* By three months, the fetus weighs about 3 oz
* Experiences the period of greatest brain growth during the fourth, fifth, and sixth months

Question 7

Age of viability

Answer 7

o Age at which a preterm newborn may survive outside the mother’s uterus if medcial care is available
o About 25 weeks after conception
o Brain is able to regulate basic body functions, ex. breathing

Question 8

Teratogen

Answer 8

o Harmful substances during pregnancy
o These include any agent or condition, including viruses, chemicals, and drugs, resulting in birth defects or even death

Question 9

Know the basic genetic difference between identical and fraternal twins.