Question 1

Fertilization:&#10;A) usually occurs on day 1 of a 28-day cycle.&#10;B) occurs within the fallopian tube.&#10;C) results in the formation of the graafian follicle.&#10;D) is a direct response to follicle-stimulating hormone (FSH) and luteinizing hormone (LH) stimulation.

Accepted Answer

After ovulation, the egg enters the fallopian tube. Fertilization normally occurs in the first third of the fallopian tube.

Question 2

When you were a zygote, how many cells did you have?&#10;A) 1&#10;B) 4&#10;C) 8&#10;D) 16

Accepted Answer

The single-cell zygote has 46 chromosomes: 23 from the egg and 23 from the sperm (restoration of the diploid number).

Question 3

Which occurs last?&#10;A) morula formation&#10;B) fertilization&#10;C) zygote formation&#10;D) implantation

Accepted Answer

When this cluster of cells reaches the uterus, it implants itself into the plush endometrial lining, where it grows and develops into a human being with billions of cells.

Question 4

Which of the following terms implies a genetic problem?&#10;A) teratogen&#10;B) hereditary&#10;C) congenital&#10;D) fetal alcohol syndrome

Accepted Answer

Hereditary diseases are genetically transmitted.

Question 5

Which of the following conditions is most related to fetal alcohol syndrome?&#10;A) infection&#10;B) rubella&#10;C) teratogen&#10;D) heredity

Accepted Answer

Toxic substances such as alcohol, drugs, and certain pathogens can cross the placental membrane and interfere with embryonic development, causing severe birth defects. These toxic substances are called teratogens.

Question 6

Which of the following is related to the early embryonic period, the embryonic period, and the fetal period?&#10;A) stages of labor&#10;B) prenatal development&#10;C) first trimester of pregnancy&#10;D) periods of organogenesis

Accepted Answer

Prenatal development includes cleavage, growth, morphogenesis, and differentiation.

Question 7

Which period involves the formation of extraembryonic membranes, the placenta, and the period of organogenesis?&#10;A) They occur during the period of implantation.&#10;B) They occur during the blastomere stage.&#10;C) They occur during the third trimester.&#10;D) They occur during the embryonic period.

Accepted Answer

The embryonic period involves the formation of extraembryonic membranes, the placenta, and all of the organ systems in the body.

Question 8

Which of the following is true of monozygotic twins?&#10;A) Each twin develops from a different zygote.&#10;B) They are fraternal twins.&#10;C) They are identical twins.&#10;D) They have congenital defects.

Accepted Answer

Each cell within the morula or blastocyst can become a complete individual. Sometimes, these cells split and two embryos begin developing at the same time, thereby producing two offspring (twins) rather than one. These are identical, or monozygotic (mon-oh-zye-GOH-tik), twins because they develop from the same zygote and have identical genetic information.

Question 9

Which of the following describes the organism immediately after birth?&#10;A) fetus&#10;B) embryo&#10;C) blastocyst&#10;D) neonate

Accepted Answer

Neonatal period: The neonatal period begins at birth and lasts for 4 weeks. During this time, Baby is called a neonate, or newborn.

Question 10

What is true about a child with an X and a Y chromosome?&#10;A) The child has Down syndrome&#10;B) The child is male.&#10;C) The child is female.&#10;D) The child has ovaries.

Accepted Answer

A male has both an X and Y chromosome in his cells, a pair designated XY.

Deck 27: Human Development and Heredity