BIOS 256 FINAL EXAM QUESTIONS & ANSWERS 2026-2027 | LATEST COMPRE…
P R O F E S S I O N A L P R A C T I C E M AT E R I A L S
BIOS 256 Final Exam
Questions & Answers 2026-
2027 | Latest
Comprehensive Exam
Review (Rationales)
Verified Answers Exam Ready With Rationales 86 QUESTIONS
DOCUMENT OVERVIEW
This comprehensive review document provides 86 BIOS 256 final exam questions, complete
with correct answers and detailed rationales for in-depth understanding of human
reproduction and development. It is suitable for dedicated study, thorough exam
preparation, and certification review.
TOPICS
Gametogenesis and Early Development Q1–Q23
Pregnancy and Trimesters Q24–Q34
Renal Physiology and Fluid Balance Q35–Q45
Acid-Base Balance and Buffering Q46–Q53
Male Reproductive System Q54–Q66
Female Reproductive Cycle and Hormones Q67–Q69
Cellular Respiration and Metabolism Q70–Q79
Genetics and Inheritance Q80–Q86
Page 1
, E XA M Q U EST I O N S
Q1 QUESTION 1 OF 86
what are male gametes?
CORRECT ANSWER
Sperm
RATIONALE
Sperm are the male gametes, which are reproductive cells produced by males. These haploid cells
contain half the genetic material of a diploid organism and are responsible for fertilizing the female
gamete, the ovum.
Q2 QUESTION 2 OF 86
What are female gametes?
CORRECT ANSWER
Secondary oocytes
RATIONALE
Female gametes are mature female reproductive cells. In humans and many other animals, the
female gamete is the secondary oocyte, which is released from the ovary during ovulation.
Q3 QUESTION 3 OF 86
Cleavage of zygote
Page 2
, CORRECT ANSWER
Mitotic division after fertilization
Day 1: two-cell stage
Day 2: four-cell stage
Day 3: eight-cell stage
Day 4: morula
Day 5: blastocyst
Day 6: Implantation in uterine wall
FIGURE 29.5
RATIONALE
The provided answer describes the process of zygote cleavage, which refers to the rapid mitotic
cell divisions that occur after fertilization. This process begins with a single-celled zygote and
progresses through distinct stages like the two-cell, four-cell, and eight-cell stages, eventually
forming a morula and then a blastocyst by day 5.
Q4 QUESTION 4 OF 86
Process of spermatogenesis
CORRECT ANSWER
Spermatogonia (germ cells)-- Primary spermatocyte (2n)-- Meiosis I occurs-- Secondary
spermatocytes 2 of (n), Meiosis II occurs-- Spermatids 4 of (n)-- Spermiogenesis (production
of sperm)
RATIONALE
Spermatogenesis is the process by which male gametes, sperm, are produced from germ cells
called spermatogonia. This process begins with diploid spermatogonia (2n) differentiating into
primary spermatocytes, which then undergo meiosis I to produce two haploid secondary
spermatocytes (n).
Q5 QUESTION 5 OF 86
What do the ovaries produce?
CORRECT ANSWER
estrogen, progesterone, inhibin, and relaxin, and gametes, and eggs
Page 3
, RATIONALE
The ovaries are endocrine glands and gonads responsible for producing several key hormones and
reproductive cells. They secrete estrogen and progesterone, which regulate the menstrual cycle
and secondary sexual characteristics, as well as inhibin, which suppresses follicle-stimulating
hormone (FSH), and relaxin, which is important during pregnancy.
Q6 QUESTION 6 OF 86
Stages of ovarian follicles
CORRECT ANSWER
Primordial follicle, Primary follicle, Secondary follicle, first polar body + secondary oocyte,
mature follicle ruptures and releases the secondary oocyte (ovulation)
RATIONALE
The stages of ovarian follicle development progress from primordial follicles, which contain a
single layer of flattened follicular cells surrounding an oocyte, to primary follicles, characterized by
cuboidal granulosa cells. Further development leads to secondary follicles with multiple layers of
granulosa cells and the formation of an antrum.
Q7 QUESTION 7 OF 86
Stages of oocyte
CORRECT ANSWER
Oogonium-- primary oocyte(2n)-- Secondary oocyte (n)+ first polar body(n)-- Secondary
oocyte released-- fertilization by sperm-- ovum-- zygote(2n)
RATIONALE
Oogonium-- primary oocyte(2n)-- Secondary oocyte (n)+ first polar body(n)-- Secondary oocyte
released-- fertilization by sperm-- ovum-- zygote(2n), which differentiate into primary oocytes.
During meiosis I, each primary oocyte divides into a secondary oocyte and a first polar body, both
haploid.
Q8 QUESTION 8 OF 86
One primary oocyte gives rise to how many ovum?
Page 4
P R O F E S S I O N A L P R A C T I C E M AT E R I A L S
BIOS 256 Final Exam
Questions & Answers 2026-
2027 | Latest
Comprehensive Exam
Review (Rationales)
Verified Answers Exam Ready With Rationales 86 QUESTIONS
DOCUMENT OVERVIEW
This comprehensive review document provides 86 BIOS 256 final exam questions, complete
with correct answers and detailed rationales for in-depth understanding of human
reproduction and development. It is suitable for dedicated study, thorough exam
preparation, and certification review.
TOPICS
Gametogenesis and Early Development Q1–Q23
Pregnancy and Trimesters Q24–Q34
Renal Physiology and Fluid Balance Q35–Q45
Acid-Base Balance and Buffering Q46–Q53
Male Reproductive System Q54–Q66
Female Reproductive Cycle and Hormones Q67–Q69
Cellular Respiration and Metabolism Q70–Q79
Genetics and Inheritance Q80–Q86
Page 1
, E XA M Q U EST I O N S
Q1 QUESTION 1 OF 86
what are male gametes?
CORRECT ANSWER
Sperm
RATIONALE
Sperm are the male gametes, which are reproductive cells produced by males. These haploid cells
contain half the genetic material of a diploid organism and are responsible for fertilizing the female
gamete, the ovum.
Q2 QUESTION 2 OF 86
What are female gametes?
CORRECT ANSWER
Secondary oocytes
RATIONALE
Female gametes are mature female reproductive cells. In humans and many other animals, the
female gamete is the secondary oocyte, which is released from the ovary during ovulation.
Q3 QUESTION 3 OF 86
Cleavage of zygote
Page 2
, CORRECT ANSWER
Mitotic division after fertilization
Day 1: two-cell stage
Day 2: four-cell stage
Day 3: eight-cell stage
Day 4: morula
Day 5: blastocyst
Day 6: Implantation in uterine wall
FIGURE 29.5
RATIONALE
The provided answer describes the process of zygote cleavage, which refers to the rapid mitotic
cell divisions that occur after fertilization. This process begins with a single-celled zygote and
progresses through distinct stages like the two-cell, four-cell, and eight-cell stages, eventually
forming a morula and then a blastocyst by day 5.
Q4 QUESTION 4 OF 86
Process of spermatogenesis
CORRECT ANSWER
Spermatogonia (germ cells)-- Primary spermatocyte (2n)-- Meiosis I occurs-- Secondary
spermatocytes 2 of (n), Meiosis II occurs-- Spermatids 4 of (n)-- Spermiogenesis (production
of sperm)
RATIONALE
Spermatogenesis is the process by which male gametes, sperm, are produced from germ cells
called spermatogonia. This process begins with diploid spermatogonia (2n) differentiating into
primary spermatocytes, which then undergo meiosis I to produce two haploid secondary
spermatocytes (n).
Q5 QUESTION 5 OF 86
What do the ovaries produce?
CORRECT ANSWER
estrogen, progesterone, inhibin, and relaxin, and gametes, and eggs
Page 3
, RATIONALE
The ovaries are endocrine glands and gonads responsible for producing several key hormones and
reproductive cells. They secrete estrogen and progesterone, which regulate the menstrual cycle
and secondary sexual characteristics, as well as inhibin, which suppresses follicle-stimulating
hormone (FSH), and relaxin, which is important during pregnancy.
Q6 QUESTION 6 OF 86
Stages of ovarian follicles
CORRECT ANSWER
Primordial follicle, Primary follicle, Secondary follicle, first polar body + secondary oocyte,
mature follicle ruptures and releases the secondary oocyte (ovulation)
RATIONALE
The stages of ovarian follicle development progress from primordial follicles, which contain a
single layer of flattened follicular cells surrounding an oocyte, to primary follicles, characterized by
cuboidal granulosa cells. Further development leads to secondary follicles with multiple layers of
granulosa cells and the formation of an antrum.
Q7 QUESTION 7 OF 86
Stages of oocyte
CORRECT ANSWER
Oogonium-- primary oocyte(2n)-- Secondary oocyte (n)+ first polar body(n)-- Secondary
oocyte released-- fertilization by sperm-- ovum-- zygote(2n)
RATIONALE
Oogonium-- primary oocyte(2n)-- Secondary oocyte (n)+ first polar body(n)-- Secondary oocyte
released-- fertilization by sperm-- ovum-- zygote(2n), which differentiate into primary oocytes.
During meiosis I, each primary oocyte divides into a secondary oocyte and a first polar body, both
haploid.
Q8 QUESTION 8 OF 86
One primary oocyte gives rise to how many ovum?
Page 4
