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5 Leydig cells ________.secrete testosterone b.activate the sperm flagellum c.support spermatogenesis d.secrete seminal fluid e.

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5


Leydig cells ________.

a.       secrete testosterone

b.      activate the sperm flagellum

c.       support spermatogenesis

d.      secrete seminal fluid

e.       secrete estrogen


What is the function of the epididymis?

a.       sperm maturation and storage

b.      produces the bulk of seminal fluid

c.       provides nitric oxide needed for erections

d.      spermatogenesis

e.       oogenesis


Spermatogenesis takes place in the ________.

a.       prostate gland

b.      glans penis

c.       seminiferous tubules

d.      ejaculatory duct

e.       ovaries


From what structure does the corpus luteum originate?

a.       uterine corpus

b.      dominant follicle

c.       fallopian tube

d.      corpus albicans

e.       cervix


What controls whether an embryo will develop testes or ovaries?

a.       pituitary gland

b.      hypothalamus

c.       Y chromosome

d.      X chromosome

e.       presence or absence of estrogen


The positioning of the testes in scrotum allows a temperature that

a.       is lower than the body's core temperature

b.      is higher than body's core temperature

c.       is the same as body's core

d.      stays the same despite external temperatures

e.       inhibits poorly-timed arousal.


Sperm and urine both are carried to the penis by the same tube, which is called the

a.       seminiferous tubules

b.      epididymis

c.       urethra

d.      ureter

e.       ductus deferens


The LH surge produces

a.       abortion.

b.      fertilization.

c.       increased FSH secretion.

d.      ovulation.

e.       sperm migration.


Ovulation usually occurs ________ days before the onset of the next menstruation.

a.       5

b.      10

c.       14

d.      21

e.       28


An ecotopic pregnancy usually occurs

a.       in the myometrium

b.      the ovarian ligament

c.       uterus

d.      the uterine tubes

e.       uretha


The contribution from the sex accessory glands makes up about ________ percent of the male ejaculate.

a.       1

b.      10

c.       40

d.      75

e.       99


The acrosome helps

a.       the sperm penetrate the ovum.

b.      increase sperm cell production.

c.       inhibit egg cell production.

d.      speed up sperm motility

e.       provide energy for propulsion


Sperm and ova are similar in terms of ________.

a.       size

b.      quantity produced per year

c.       chromosome number

d.      flagellar motility

e.       mitosis


The fetal period is:

a.       the first week of gestation

b.      the first 5 weeks of gestation

c.       the first 8 weeks of gestation

d.      the 8th to 10 weeks

e.       the 9th week to birth


The function of the placenta is:

a.       diffusion of maternal glucose, amino acids, fatty acids, vitamins, and minerals

b.      mediation of the maternal-to-fetal oxygen transport and fetal-to-maternal carbon dioxide transport

c.       secretion of hCG, estrogens, and progesterone, to maintain the pregnancy

d.      removal of fetal wastes into maternal blood

e.       all of the above


The inner cell mass of the blastocyst is destined to become the ________.

a.       embryo

b.      trophoblast

c.       chorionic villi

d.      placenta

e.       fetus


What would happen if the trophoblast did not secrete hCG upon implantation of the blastocyst?

a.       The cells would not continue to divide.

b.      The corpus luteum would continue to produce progesterone and estrogen.

c.       Menses would flush the blastocyst out of the uterus.

d.      The uterine mucosa would not envelop the blastocyst.

e.       None of the above


How is colostrum most important to a newborn?

a.       It helps boost the newborn's immune system.

b.      It provides much needed fat.

c.       It satisfies the newborn's thirst.

d.      It satisfies the infant's appetite

e.       All of the above


The foramen ovale causes the fetal circulatory system to bypass the ________.

a.       liver

b.      lungs

c.       kidneys

d.      gonads

e.       heart


A chromosome's gene sequence that was ABCDEFG before modification and ABCDLMNOP afterward is an example of

a.    Inversion

b.   Deletion

c.    Duplication

d.   Translocation

e.    Crossing over.


____ converts a ____ into ovum.

a.       Fertilization, primary oocyte

b.      Meiosis I, primary oocyte

c.       Meiosis I, 2secondary oocyte

d.      Meiosis II, primary oocyte

e.       Meiosis II, secondary oocyte


In addition to codominance, the ABO blood group antigens are also an example of ________.

a.       incomplete dominance

b.      X-linked recessive inheritance

c.       multiple alleles

d.      recessive lethal inheritance

e.       complete dominance


Alleles are different versions of a ____.

a.       chromosome

b.      chromatid

c.       phenotype

d.      gene

e.       genotype


Which does NOT produce variation?

a.    crossing over

b.   random alignment of chromosomes during meiosis

c.    asexual reproduction

d.   genetic recombination of alleles

e.    sexual reproduction


Homologous chromosomes

a.    are the same size

b.   have genes for the same characteristics (even though the alleles may not be the same)

c.    are in pairs, one chromosome of each pair from the father and one from the mother

d.   pair up during meiosis

e.    are all of these


Mendel suggested that the paired hereditary factors of a parent must separate during gamete formation. This is the principle of

a.       Assortment.

b.      fertilization.

c.       independent assortment.

d.      segregation.

e.       unpairing.


Select the total chromosome number per body cell that represents a monosomy in humans.

a.       1

b.      2

c.       23

d.      45

e.       47


If a germ cell has 20 chromosomes, how many chromosomes will you find in the daughter cells, after meiosis?

a.       10

b.      20

c.       30

d.      40

e.       80


Crossing over occurs between homologous chromosomes during what stage of cell division?

a.       Interphase

b.      Prophase I of meiosis

c.       Prophase II of meiosis

d.      Prophase I of mitosis

e.       Prophase II of mitosis


Mitosis results in ___cells and meiosis results in ___ cells.

a.       diploid, diploid

b.      haploid, haploid

c.       haploid, diploid

d.      diploid, haploid


Sexual reproduction

a.    leads to uniform characteristics in a population

b.   results in new combinations of genetic traits

c.    produces genetic clones

d.   requires less tissue differentiation than asexual reproduction

e.    produces genetic clones and requires less tissue differentiation than asexual reproduction


The sister chromatids become separated during ____ of meiosis

a.    metaphase I

b.   anaphase I

c.    telophase I

d.   anaphase II

e.    prophase II


In incomplete dominance

a.    one allele is not dominant to another allele

b.   the genotype can be determined by the phenotype

c.    the heterozygote is somewhat intermediate to the two homozygotes

d.   the intermediate phenotype may be the result of enzyme insufficiency.

e.    all of these are true


Mendel's law of independent assortment states that

a.    one allele is always dominant to another

b.   hereditary units from the male and female parents are blended in the offspring

c.    the two hereditary units that influence a certain trait segregate during gamete formation

d.   each hereditary unit is inherited separately from other hereditary units

e.    all of these are true


Nondisjunction in meiosis II results in: _______

a.       Two cells missing a chromosome and two healthy cells

b.      Two cells missing a chromosome and two cells with an additional chromosome

c.       Two cells with an additional chromosome and two healthy cells

d.      One cell missing a chromosome, one cell with an additional chromosome and two healthy cells

e.       None of these answers could be true


According to Mendel, what kinds of genes "disappear" in F1 pea plants?

a.    sex-linked

b.   dominant

c.    recessive

d.   codominant

e.    lethal


For Mendel's explanation of inheritance to be correct

a.    the genes for the traits he studied had to be located on the same chromosome

b.   which gametes combine at fertilization had to be due to chance

c.    genes could not be transmitted independently of each other

d.   only diploid organisms would demonstrate inheritance patterns

e.    none of these would occur


A testcross involves

a.    two F1 hybrids

b.   an F1 hybrid and a heterozygous organism

c.    two parental organisms

d.   an F1 hybrid and the homozygous dominant parent

e.    an F1 hybrid and an organism that is homozygous recessive for that trait


An individual with a genetic makeup of aa BB is said to be

a.       pure-breeding

b.      recessive

c.       hybrid

d.      dihybrid

e.       heterozygous


An X-linked carrier is a

a.    homozygous dominant female.

b.   heterozygous female.

c.    homozygous recessive female.

d.   homozygous male.

e.    heterozygous male.

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