Term
| Which of the following describes BOTH mitosis and meiosis? |
|
Definition
They both involve the division (reproduction) of cells.
They both involve the duplication (copying) of chromosomes. |
|
|
Term
| When two people reproduce, their offspring usually have the same number of chromosomes as each of the parents because... |
|
Definition
| people reproduce using cells produced my meiosis, which produces cells with half the normal number of chromosomes. |
|
|
Term
| Although it is somewhat less likely, fertilization can take place even if the penis is withdrawn from the vagina before the expulsion of sperm. This is true because… |
|
Definition
| there are a small number of sperm in a man's urethra after emission, but before expulsion. |
|
|
Term
| Which of the following is a function of the female reproductive system, but NOT the male reproductive system? |
|
Definition
| Nourishment and protection of developing embryo. |
|
|
Term
| Which of the following describe a function of both female and male gonads? |
|
Definition
Production of gametes (sperm or eggs) by meiosis.
Production of hormones that regulate other parts of the body. |
|
|
Term
| Which of the following describes a similarity between the male and female reproductive systems? |
|
Definition
| Regulation is by the brain and pituitary gland. |
|
|
Term
| The presence of a Y chromosome in the cells of an embryo usually causes development of the gonads and external genitals toward… |
|
Definition
|
|
Term
| Which of the following pairs of structures (male and female, respectively) form from the same embryonic structure during development? |
|
Definition
head of penis and clitoris
testes and ovaries
scrotum and labia |
|
|
Term
| Which of the following happens FIRST in the series of causes that determine gender in a typical male? |
|
Definition
| differentiation of gonads into testes |
|
|
Term
| An embryo that has a Y chromosome, but has cells that do not respond to testosterone... |
|
Definition
will make testes.
will make testosterone. |
|
|
Term
| Where in a woman's reproductive system does fertilization usually occur? |
|
Definition
|
|
Term
| Besides producing a complete set of chromosomes, fertilization… |
|
Definition
| initiates the first stage of development (called cleavage). |
|
|
Term
| What happens during the first part of development (which is called cleavage)? |
|
Definition
The fertilized egg divides into more than one cell.
A mass of many cells (called a morula) is produced.
The cytoplasm of the egg is divided non-uniformly among the resulting cells. |
|
|
Term
| Everyone begins as a single cell. During development, cells in different parts of the body become different from each other because... |
|
Definition
| they all contain the same genes but different cells use (turn on) different genes. |
|
|
Term
| Which of the following is a result of gastrulation? |
|
Definition
| The digestive tube (gut) is formed. |
|
|
Term
| Which substances can move between fetus and mother across the placenta? |
|
Definition
nutrients (like sugar, amino acids, etc.)
wastes (like carbon dioxide)
oxygen
alcohol |
|
|
Term
| Which of the following describes the process of induction? |
|
Definition
| One structure signals nearby cells to form another structure. |
|
|
Term
| Pattern formation (like the development of the structures in an arm or leg) is a result of individual cells becoming different structures depending on… |
|
Definition
| a concentration gradient of a signal molecule. |
|
|
Term
| Fetal circulation differs from that of babies and adults by having much less blood flowing through the… |
|
Definition
|
|
Term
| The stages of parturition (birth) take place in what order? |
|
Definition
| dilation---baby is delivered---placenta is delivered |
|
|
