ALU 301: A&P Chapter 21: Human
Development & Genetics Exam
Questions & Answers 100% Rated
Alleles - ANSWER-Gene possibilities. A person has two alleles for each protein or
trait, they can be the same or different.
Amnion - ANSWER-an embryonic membrane that holds the fetus suspended in
amniotic fluid; fuses with the chorion by the end of the third month of gestation
Amniotic fluid - ANSWER-the fluid contained within the amnion; cushions the fetus
and absorbs shock
Autosomes - ANSWER-chromosomes other than the sex chromosomes; for people
there are 22 pairs of autosomes in each somatic cell
Cleavage - ANSWER-the series of mitotic cell divisions that take place in a fertilized
egg; forms the early multicellular embryonic stages
Embryo - ANSWER-the developing human individual from the time of implantation
until the 8th wk of gestation. At 12 days the embryonic disc is a plate of cells within
blastocyst. As they divide, the plate folds.
Genotype - ANSWER-the genetic makeup of an individual; the genes that are
present
Gestation - ANSWER-the length of time from conception to birth; the human
gestation period is 280 days
Heterozygous - ANSWER-having two different alleles for a trait
Homozygous - ANSWER-having two similar alleles for a trait
Implantation - ANSWER-embedding of the embryonic blastocyst in the endometrium
of the uterus 5 to 8 days after fertilization. The outer layer of cells is called a
(trophoblast), the inner cell mass is called (embryoblast)
Labor - ANSWER-the process by which a fetus is expelled from the uterus through
the vagina to the exterior of the body.
Stage 1: Dilation of cervix, uterus contracts, sac is forced into cervix, water breaks.
Stage 2: Delivery of infant. Oxytocin is released causing more powerful contractions
Stage 3: Delivery of Afterbirth.
Development & Genetics Exam
Questions & Answers 100% Rated
Alleles - ANSWER-Gene possibilities. A person has two alleles for each protein or
trait, they can be the same or different.
Amnion - ANSWER-an embryonic membrane that holds the fetus suspended in
amniotic fluid; fuses with the chorion by the end of the third month of gestation
Amniotic fluid - ANSWER-the fluid contained within the amnion; cushions the fetus
and absorbs shock
Autosomes - ANSWER-chromosomes other than the sex chromosomes; for people
there are 22 pairs of autosomes in each somatic cell
Cleavage - ANSWER-the series of mitotic cell divisions that take place in a fertilized
egg; forms the early multicellular embryonic stages
Embryo - ANSWER-the developing human individual from the time of implantation
until the 8th wk of gestation. At 12 days the embryonic disc is a plate of cells within
blastocyst. As they divide, the plate folds.
Genotype - ANSWER-the genetic makeup of an individual; the genes that are
present
Gestation - ANSWER-the length of time from conception to birth; the human
gestation period is 280 days
Heterozygous - ANSWER-having two different alleles for a trait
Homozygous - ANSWER-having two similar alleles for a trait
Implantation - ANSWER-embedding of the embryonic blastocyst in the endometrium
of the uterus 5 to 8 days after fertilization. The outer layer of cells is called a
(trophoblast), the inner cell mass is called (embryoblast)
Labor - ANSWER-the process by which a fetus is expelled from the uterus through
the vagina to the exterior of the body.
Stage 1: Dilation of cervix, uterus contracts, sac is forced into cervix, water breaks.
Stage 2: Delivery of infant. Oxytocin is released causing more powerful contractions
Stage 3: Delivery of Afterbirth.
