anatomy 2222222 Flashcards
What occurs during the first meiotic division?
A) A sperm and egg form.
B) Homologous chromosome pairs separate.
C) Homologous chromosome pairs join.
D) The cell becomes diploid.
B) Homologous chromosome pairs separate.
22) During meiosis II, one spindle fiber fails to attach to a chromosome at the
centromere. How will this affect the genetic content of the daughter cells?
A) One daughter cell will have two chromosomes and the other daughter cell will have
no chromosomes.
B) One daughter cell will have only maternal genes and the other daughter cell will have
only paternal genes.
C) One daughter cell will contain one extra chromosome and the other daughter cell will
have one less of that chromosome.
D) One daughter cell will have three copies of a chromosome and the other daughter cell
will have two copies of that chromosome
C) One daughter cell will contain one extra chromosome and the other daughter cell will
have one less of that chromosome.
Why is meiosis necessary?
A) Otherwise the fertilized ovum will have too much genetic material.
B) Otherwise the fertilized ovum will have too little genetic material.
C) Otherwise reproduction would have to be asexual.
D) Otherwise too many mutations will occur
A) Otherwise the fertilized ovum will have too much genetic material.
Identify the correct sequence for the steps of meiosis I.
A) Interphase → mitosis → meiosis
B) Telophase I → anaphase I → metaphase I → prophase I
C) 46 chromosomes → 23 chromosomes → 46 chromosomes
D) Prophase I → metaphase I → anaphase I → telophase
D) Prophase I → metaphase I → anaphase I → telophase
How many chromosomes are present in each cell at the end of meiosis I?
A) 12 chromosomes
B) 23 chromosomes
C) 46 chromosomes
D) 68 chromosomes
B) 23 chromosomes
How many sperm cells form from a primary spermatocyte?
A) 4
B) 16
C) 46
D) 100
A) 4
The head of the sperm is primarily composed of_________.
A) mitochondria
B) a cell membrane
C) cytoskeleton
D) a nucleus
D) a nucleus
In the male, which of the following structures is unpaired?
A) Seminal vesicle
B) Ductus deferens
C) Bulbourethral gland
D) Prostate gland
D) Prostate gland
What do the bulbourethral glands secrete?
A) Sperm
B) A mucus-like fluid
C) Urine
D) Sweat
B) A mucus-like fluid
Describe the composition of semen.
A) It contains 100 mature sperm.
B) It is acidic.
C) It includes prostaglandins and nutrients.
D) It contains secretions from intersitial cell
C) It includes prostaglandins and nutrients.
Where do sperm cells mature?
A) In the ductus deferens
B) In the ejaculatory duct
C) In the epididymis
D) In the seminal vesicl
C) In the epididymis
Undifferentiated spermatogenic cells are called_________.
A) spermatogonia
B) primary spermatocytes
C) secondary spermatocytes
D) spermatids
A) spermatogonia
What is the function of the epididymis?
A) Secretion of testosterone
B) Secretion of mucus-like fluid
C) Site of sperm maturation
D) Ejaculation of sperm due to rhythmic contraction
C) Site of sperm maturation
What hormone is responsible for the development and maintenance of male
secondary sex characteristics?
A) LH
B) FSH
C) Testosterone
D) GnRH
C) Testosterone
Which of the following isnot a male secondary sex characteristic?
A) Thickening of the bones
B) Increased muscular growth
C) Increased growth of body hair
D) Deposition of adipose tissue in the thighs and buttock
D) Deposition of adipose tissue in the thighs and buttock
What stimulates the release of testosterone?
A) Increased plasma concentration of LH
B) Decreased plasma concentration of LH
C) Decreased plasma concentration of FSH
D) Increased plasma concentration of FSH
A) Increased plasma concentration of LH
The tubular part of the uterus that extends downward into the upper vagina is
the_________.
A) fundus
B) cervix
C) perimetrium
D) endometrium
B) cervix
The egg, or ovum, is more correctly called a(n)__________.
A) primary oocyte
B) secondary oocyte
C) oogonium
D) zygote
B) secondary oocyte
A Pap smear is used to detect abnormal cells in the__________.
A) urethra
B) ovary
C) cervix
D) vagina
C) cervix
Fertilization normally occurs in the__________.
A) ovary
B) uterine tube
C) uterus
D) vagina
B) uterine tube
What occurs in the first step of oogenesis?
A) Secondary oocyte divides to form a polar body and an egg cell.
B) Primary oocyte divides to form a secondary oocyte and a first polar body.
C) Primary oocyte divides to form two secondary oocytes.
D) Secondary oocyte divides to form two polar bodies
B) Primary oocyte divides to form a secondary oocyte and a first polar body.
Menopause is due to aging of the________.
A) ovaries
B) vagina
C) cervix
D) uterine tube
A) ovaries
What hormone(s) is/are mainly responsible for the development and maintenance of
female secondary sexual characteristics?
A) Estrogens
B) Progesterone
C) Androgens
D) Luteinizing hormone
A) Estrogens
Ovulation is triggered by a surge of_________ from the anterior pituitary gland.
A) estrogens
B) progesterone
C) LH
D) androgens
C) LH
