Save
Busy. Please wait.
Log in with Clever
or

show password
Forgot Password?

Don't have an account?  Sign up 
Sign up using Clever
or

Username is available taken
show password

Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.


Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.

Question

Regeneration, the regrowth of lost body parts, normally follows
click to flip
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't know

Question

One of the evolutionary "enigmas," or unsolved puzzles, of sexual reproduction is that
Remaining cards (83)
Know
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Bio Final

QuestionAnswer
Regeneration, the regrowth of lost body parts, normally follows fragmentation
One of the evolutionary "enigmas," or unsolved puzzles, of sexual reproduction is that only half of the offspring from sexually reproducing females are also females
An advantage of asexual reproduction is that asexual reproduction enables the species to rapidly colonize habitats that are favorable to that species
Genetic mutations in asexually reproducing organisms lead to more evolutionary change than do genetic mutations in sexually reproducing ones because asexually reproducing organisms, but not sexually reproducing organisms, pass all mutations on to their offspring.
Asexual reproduction results in greater reproductive success than does sexual reproduction when a species is in stable and favorable environments.
Sexual reproduction patterns include the example of hermaphroditism
Sexual reproduction can produce diverse phenotypes that may enhance survival of a population in a changing environment.
Environmental cues that influence the timing of reproduction generally do so by direct effects on hormonal control mechanisms.
For water fleas of the genus Daphnia, switching from a pattern of asexual reproduction to sexual reproduction coincides with periods of temperature or food stresses on adults.
All individuals of a particular species of whiptail lizards are females. Their reproductive efforts depend on meiosis followed by a doubling of the chromosomes in eggs.
Evidence that parthenogenic whiptail lizards are derived from sexually reproducing ancestors includes the requirement for male-like behaviors in some females before their partners will ovulate.
Like many other fishes, bluehead wrasses utilize harem mating as they reproduce sexually. However, unlike most fishes, large females morph into reproductively competent males.
Which of the following patterns of reproduction are found only among invertebrate animals? fission and budding
Animals with reproduction dependent on internal fertilization need not have internal development of embryos.
In close comparisons, external fertilization often yields more offspring than does internal fertilization. However, internal fertilization offers the advantage that the smaller number of offspring produced often receive a greater amount of parental investment.
Internal and external fertilization both produce single-celled zygotes.
Organisms with a reproductive pattern that produces shelled amniotic eggs generally invest most of their reproductive energy in the embryonic and early postnatal development of their offspring.
Among nonmammalian vertebrates, the cloaca is an anatomical structure that functions as a shared pathway for the digestive, excretory, and reproductive systems.
External chemical signals that coordinate potential reproductive partners are called pheromones.
Females of many insect species, including honeybee queens, can store gametes shed by their mating partners in the spermatheca.
Most flatworms, including parasitic liver flukes, are hermaphrodites that form zygotes as the result of internal fertilization.
When female fruit flies mate with two different males on the same day, the second male's sperm fertilizes most of the eggs.
An oocyte released from a human ovary enters the oviduct as a result of the wavelike beating of cilia lining the oviduct.
The junction of the upper vagina and the uterus is called the cervix.
In humans, the follicular cells that remain behind in the ovary following ovulation become a steroid-hormone synthesizing structure called the corpus luteum.
Among mammals, the male and female genital structures that consist mostly of erectile tissue include the penis and clitoris.
Testosterone is synthesized primarily by the Leydig cells.
Sperm cells are stored within human males in the epididymis.
Among human males, both semen and urine normally travel along the urethra.
Human sperm cells first arise in the seminiferous tubules.
The surgical removal of the seminal vesicles would likely greatly reduce the volume of semen.
Most of the noncellular fluid in ejaculated human semen is composed of the secretions of the seminal vesicles.
Increasing the temperature of the human scrotum by 2°C (i.e., near the normal body core temperature) and holding it there would reduce the fertility of the man by impairing spermatogenesis.
During human heterosexual (mutual) excitement, vasocongestion occurs in the clitoris, vagina, and penis.
The moment of orgasm is characterized by rhythmic contraction of many parts of the reproductive system.
At the time of fertilization, the complete maturation of each oogonium has resulted in one secondary oocyte.
In vertebrate animals, spermatogenesis and oogenesis differ in that cytokinesis is unequal in oogenesis, whereas it is equal in spermatogenesis.
Mature human sperm and ova are similar in that they both have the same number of chromosomes.
A male's "primary" sex characteristics include embryonic differentiation of the seminal vesicles.
The primary difference between estrous and menstrual cycles is that the endometrium shed by the uterus during the estrous cycle is reabsorbed, whereas the shed endometrium of menstrual cycles is excreted from the body.
At the end of a nonpregnant ovarian cycle, the breakdown and discharge of the soft uterine tissues is called menstruation.
In correct chronological order, the three phases of the human ovarian cycle are follicular → ovulation → luteal.
In correct chronological order, the three phases of the human uterine cycle are menstrual → proliferative → secretory.
A contraceptive pill that continuously inhibits the release of GnRH from the hypothalamus will reduce the secretion of gonadotropins from the anterior pituitary gland.
A function-disrupting mutation in the progesterone receptor gene would likely result in the inability of the uterus to support pregnancy.
A primary response by the Leydig cells in the testes to the presence of luteinizing hormone is an increase in the synthesis and secretion of testosterone.
A reproductive hormone that is secreted directly from a structure in the brain is gonadotropin-releasing hormone.
The primary function of the corpus luteum is to maintain progesterone and estrogen synthesis after ovulation has occurred.
For the 10 days following ovulation in a nonpregnant menstrual cycle, the main source of progesterone is the corpus luteum.
Ovulation is the follicular response to a burst of secretion of LH.
Prior to ovulation, the primary steroid hormone secreted by the growing follicle is estradiol.
The hypothalamic hormone that stimulates hormone secretion by the anterior pituitary gland is GnRH.
The hormone progesterone is produced in the ovary and acts directly on the uterus.
Menopause is characterized by reduced synthesis of ovarian steroids despite high levels of gonadotropin hormones.
For normal human fertilization to occur, only one sperm need penetrate one egg.
Fertilization of human eggs usually takes place in the oviduct.
What is the embryo-produced hormone that maintains progesterone and estrogen secretion by the corpus luteum through the first trimester of pregnancy? human chorionic gonadotropin (HCG)
The hypothalamic hormone that triggers the secretion of FSH is gonadotropin-releasing hormone (GnRH).
Labor contractions can be increased by the medical use of a synthetic drug that mimics the action of oxytocin.
A high rate of metabolic activity is maintained in the pregnant uterus by progesterone.
The secretion of follicle-stimulating hormone from the anterior pituitary gland is reduced by inhibin.
The drug RU-486 functions by blocking progesterone receptors in the uterus.
Human fertility drugs taken by women increase the chance of multiple births, probably because they stimulate the development of many ovarian follicles.
The thin layer of the developing embryo which secretes a hormone that keeps the corpus luteum functioning is the chorion.
In excreted urine, a reliable "marker" that a pregnancy has initiated is chorionic gonadotropin.
The "immunotolerance" of a pregnant woman toward her unborn child is the result of the relative quiescence of a pregnant woman's immune system compared to when she was not pregnant.
Among these contraception methods, the highest risk of accidental pregnancy accompanies the practice of coitus interruptus.
The use of birth control pills (oral contraceptives) reduces the incidence of ovulation.
Two contraceptive methods that are generally irreversible and which block the gametes from moving to a site where fertilization can occur are vasectomy and tubal ligation.
Tubal ligation prevents oocytes from entering the uterus.
A vasectomy prevents sperm from exiting the male urethra.
Time-release progesterone implants function in contraception by thickening the cervical and uterine mucus to impair sperm movement.
For lactation to take place, the synthesis of breast milk and its release from the mammary gland, respectively, are caused by prolactin and oxytocin
So-called "combination" birth control pills function in contraception by inhibiting the release of GnRH, FSH, and LH.
You observe vertebrate organisms with parthenogenetic reproduction, internal development of embryos, and the lack of parental care for its young. Based on this information, you should categorize these organisms as lizards.
Imagine that a woman is in the final week of her pregnancy. Her doctor gives her an injection of oxytocin. The likely result of this is that the pregnant woman would undergo vigorous contractions of her uterine muscles.
Which of the following characterizes parthenogenesis? An egg develops without being fertilized.
In male mammals, excretory and reproductive systems share the urethra.
Which of the following is not properly paired? seminiferous tubulecervix
Peaks of LH and FSH production occur during the period just before ovulation.
During human gestation, rudiments of all organs develop in the first trimester.
Which of the following is a true statement? The endometrial lining is shed in menstrual cycles but reabsorbed in estrous cycles.
For which of the following is the number the same in spermatogenesis and oogenesis? meiotic divisions required to produce each gamete
Which statement about human reproduction is false? The earliest stages of spermatogenesis occur closest to the lumen of the seminiferous tubules.
 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
Retries:
restart all cards