Lab #16 Reproduction & Embryology - Reproduction

Question 1

A zygote is formed from ______________.

A male sex cell

A female sex cell

Both a male and female sex cell

A gastrula and blastula

Answer 1

Both a male and female sex cells

Question 2

Place the following in order from the least number of cells to the most number of cells.

Zygote, morula, gastrula, blastula

Morula, blastula, gastrula, zygote

Zygote, morula, blastula, gastrula

Gastrula, zygote, morula, blastula

Answer 2

Zygote, morula, blastula, gastrula

Question 3

Which of the following reproductive hormones is released by the chorion and keeps the corpus luteum active during embryonic development?

Beta chorionic gonadotropin (B-HCG)

Progesterone

Estrogen

All of these are correct

Answer 3

Beta chorionic gonadotropin (B-HCG)

Question 4

Which of the following reproductive hormones maintains the endometrium of the uterus for the support of the developing embryo?

Beta chorionic gonadotropin (B-HCG)

Progesterone

Estrogen

All of these are correct

Answer 4

Progesterone

Question 5

During the first two to four weeks of the ______________ of development, nutrition and waste are handled by the endometrial lining through diffusion.

First trimester

Second trimester

Third trimester

Fourth trimester

Answer 5

First trimester

Question 6

Internal organs and body structures begin to develop during the ______________.

First trimester

Second trimester

Third trimester

Fourth trimester

Answer 6

First trimester

Question 7

During the ______________ of human development, the fetus grows to about 30 cm (12 inches), becomes active and the mother usually feels the first movements. All organs and structures continue to develop. The placenta has taken over the functions of nutrition and waste and the production of estrogen and progesterone from the corpus luteum, which has degenerated.

First trimester

Second trimester

Third trimester

Fourth trimester

Answer 7

Second trimester

Question 8

During the _____________of human development, the fetus grows to 3 to 4 kg (6 ½ -8 ½ lbs.) and about 50 cm (19-20 inches) long. This is the period of the most rapid growth during the pregnancy. Organ development continues to birth (and some systems, such as the nervous system and liver, continue to develop after birth). The mother will be at her most uncomfortable during this trimester. She may urinate frequently due to pressure on the bladder from the fetus. There may also be intestinal blockage and circulatory problems, especially in her legs. Clots may form in her legs due to pressure from the fetus on returning veins as they enter the abdominal cavity.

First trimester

Second trimester

Third trimester

Fourth trimester

Answer 8

Third trimester

Question 9

The furrow that appears across the top layer of cells during the third week is called _____________.

Primative streak

Notochord

Reptiles

Gill pouches

HOX genes

Answer 9

Primative streak

Question 10

The ___________________ is a stiffening rod in chordates which is replaced by the spinal cord in humans.

Primitive streak

Notochord

Reptiles

Gill Pouches

HOX genes

Answer 10

Notochord

Question 11

The flattened disc that forms during human development first appeared in _________________ ancestors.

Primative streak

Notochord

Reptiles

Gill pouches

HOX genes

Answer 11

Reptiles

Question 12

Human embryos still contain pharyngeal pouches which parallel __________________ in fish.

Primative streak

Notochord

Reptiles

Gill pouches

HOX genes

Answer 12

Gill pouches

Question 13

Genes that control the development of human embryos called ____________ control the development of the body plan in many organisms

Primitive streak

Notochord

Reptiles

Gill pouches

HOX genes

Answer 13

HOX genes