CWRU BIO 216 |EMBRYONIC DEVELOPMENT | EXAM
2025|120 QUESTIONS WITH ACCURATE SOLUTIONS
1. Which of the following statements best describes the meiotic events
taking place during oogenesis?
Fertilization results in a resumption of meiosis and formation of
the second polar body
The primary oocyte arrests in metaphase of the first meiotic
division The secondary oocyte arrests in prophase of the
second meiotic
division
Primary oocytes begin meiosis I at puberty
Each primary oocyte will give rise to four secondary oocytes
2. Dolly, the famous sheep, was cloned
using induced pluripotent stem
cells.
homologous recombination.
somatic cell nuclear transfer.
Cre recombinase
3. Morphogens are used to determine positional axes in developing
embryos. Bicoid is a morphogen that determines where the head of a
,fly will form. High concentrations of Bicoid will result in
specification of the head region. What can we expect to see in a fly if
an embryo had high
concentrations of Bicoid in two different locations?
A fly with one head region
A fly with two head
regions A fly with three
head regions A fly
without a head region
,4. Certain molecules (polypeptides, mRNAs and other molecules)
become unevenly distributed in egg cells and, consequently, in the
two daughter
cells formed by division of an egg cell. Some of these molecules then
lead to expression of different sets of transcriptional activators in the
daughter cells. These molecules are known as
cytoplasmic determinants
morphological
determinants molecular
determinants
nuclear determinants
5. Epigenetics involves changes in the expression of a gene or set of
genes by _______ and/or _.
transcription factors; DNA methylation
repressors; chromosomal protein alteration
DNA methylation; histone protein modification
promoters; DNA methylation
chromosomal protein alteration; transcription factors
6. What is the definition of epigenetics as described in the context of
gene expression?
Changes in DNA sequence that affect gene expression
Changes in gene expression that do not alter the DNA sequence
, The process of DNA replication during cell
division The physical structure of
chromosomes in a cell
7. What are the two main events that occur during the acrosome
reaction in fertilization?
Sperm tail movement increases and the egg membrane
depolarizes.
2025|120 QUESTIONS WITH ACCURATE SOLUTIONS
1. Which of the following statements best describes the meiotic events
taking place during oogenesis?
Fertilization results in a resumption of meiosis and formation of
the second polar body
The primary oocyte arrests in metaphase of the first meiotic
division The secondary oocyte arrests in prophase of the
second meiotic
division
Primary oocytes begin meiosis I at puberty
Each primary oocyte will give rise to four secondary oocytes
2. Dolly, the famous sheep, was cloned
using induced pluripotent stem
cells.
homologous recombination.
somatic cell nuclear transfer.
Cre recombinase
3. Morphogens are used to determine positional axes in developing
embryos. Bicoid is a morphogen that determines where the head of a
,fly will form. High concentrations of Bicoid will result in
specification of the head region. What can we expect to see in a fly if
an embryo had high
concentrations of Bicoid in two different locations?
A fly with one head region
A fly with two head
regions A fly with three
head regions A fly
without a head region
,4. Certain molecules (polypeptides, mRNAs and other molecules)
become unevenly distributed in egg cells and, consequently, in the
two daughter
cells formed by division of an egg cell. Some of these molecules then
lead to expression of different sets of transcriptional activators in the
daughter cells. These molecules are known as
cytoplasmic determinants
morphological
determinants molecular
determinants
nuclear determinants
5. Epigenetics involves changes in the expression of a gene or set of
genes by _______ and/or _.
transcription factors; DNA methylation
repressors; chromosomal protein alteration
DNA methylation; histone protein modification
promoters; DNA methylation
chromosomal protein alteration; transcription factors
6. What is the definition of epigenetics as described in the context of
gene expression?
Changes in DNA sequence that affect gene expression
Changes in gene expression that do not alter the DNA sequence
, The process of DNA replication during cell
division The physical structure of
chromosomes in a cell
7. What are the two main events that occur during the acrosome
reaction in fertilization?
Sperm tail movement increases and the egg membrane
depolarizes.
