Question 1

In the process of fertilization the __________ and _________ unite,resulting in a single cell.
A)sperm; ovum
B)zygote; sperm
C)embryo; zygote
D)ovum; fetus

Accepted Answer

Fertilization occurs when the sperm from the male and the ovum (or egg) from the female unite to form a single cell, known as a zygote. This zygote then begins to divide and develop into an embryo. Therefore, choice A, which includes the sperm and ovum, is the best answer.

Question 2

__________develop when two eggs each get fertilized by two different sperm,resulting in two zygotes in the uterus at the same time.
A)Monozygotic twins
B)Fraternal twins
C)Dizygotic twins
D)Wombmates

Accepted Answer

Dizygotic twins, also known as fraternal twins, develop when two eggs are released and fertilized by two different sperm, resulting in two zygotes in the uterus at the same time.

Question 3

At fertilization,the chromosomes from the father's sperm unite with the chromosomes from the mother's egg,creating a new cell called a(n)____________.
A)embryo
B)zygote
C)genome
D)blastocyst

Accepted Answer

The new cell created after fertilization is called a zygote. The other options are not the correct term for this specific stage of development.

Question 4

The union of the ovum and sperm is called__________
A)fertilization
B)the fetal period
C)a zygote
D)an embryo

Accepted Answer

Fertilization is the process in which the sperm and ovum unite to form a single cell called a zygote, which marks the beginning of pregnancy. The zygote then undergoes cell division and differentiation to form an embryo during the embryonic period.

Question 5

Sheila was born a female with only one X chromosome on the 23^rd pair.As a result she is infertile,has difficulty learning,and did not develop breast tissue and rounded hips as her female peers did.Which disorder is likely to be diagnosed? A)PKU B)Down C)Klinefelter's D)Turner's

Accepted Answer

Turner syndrome is caused by the absence or partial absence of one X chromosome in females. This results in infertility, developmental delays, and physical traits such as a lack of breast tissue and rounded hips. PKU and Down syndrome are not related to X chromosome abnormalities, and Klinefelter's syndrome is caused by the presence of an extra X chromosome in males.

Question 6

In _________ syndrome the 23^rd pair of chromosomes is missing an X,resulting in short,infertile females. A)PKU B)Down C)Klinefelter's D)Turner's

Accepted Answer

Turner's syndrome is caused by the absence of the second sex chromosome in females, resulting in a 45,X karyotype. This leads to short stature, infertility, and other physical abnormalities. PKU is a metabolic disorder, Down syndrome is caused by an extra copy of chromosome 21, and Klinefelter's syndrome is an extra X chromosome in males. None of these are related to the missing X chromosome in Turner's syndrome.

Question 7

The specialized organ that provides nourishment and filters away waste products from the developing baby is called the _________.
A)placenta
B)uterus
C)umbilical cord
D)embryo

Accepted Answer

The placenta is a specialized organ that develops during pregnancy and attaches to the uterine wall. It provides nourishment to the developing baby through the umbilical cord and filters away waste products. The uterus is the organ where the baby develops, but it does not provide nourishment or filter waste. The umbilical cord connects the baby to the placenta and is a pathway for nutrients and oxygen, but it is not an organ. The embryo is the early stage of development before the fetus stage and does not refer to a specific organ involved in nourishment and waste filtration.

Question 8

The germinal period ___________.
A)occurs during the first two weeks after fertilization
B)occurs from 2 to 8 weeks after fertilization
C)occurs from approximately 8 weeks after fertilization to birth
D)occurs from 7 to 10 weeks after fertilization

Accepted Answer

The germinal period occurs during the first two weeks after fertilization, when the zygote travels down the fallopian tube and implants in the uterine wall, beginning the process of embryonic development.

Question 9

Monozygotic twins ___________.
A)are genetically identical
B)are genetically different
C)will be of different sexes
D)are more likely to occur when a woman is taking fertility drugs

Accepted Answer

Monozygotic twins are formed from a single fertilized egg that splits into two embryos. Therefore, they have identical genetic material.

Question 10

The placenta is ___________.
A)the tube through which a developing baby receives nourishment
B)the technical name for the "belly button"
C)a specialized organ that provides nourishment and filters away waste products from the developing baby
D)the name for the developing organism until it is 8 weeks old

Accepted Answer

The placenta is a specialized organ that develops during pregnancy and provides nourishment to the developing baby. It also filters away waste products and helps to transfer oxygen and nutrients from the mother to the baby. It is not a tube or the technical name for the "belly button." The developing organism is called an embryo until it is 8 weeks old, but this is not the same as the placenta.

Question 11

Marisa is at a point in her pregnancy when the zygote is moving down her uterus,and the placenta and umbilical cord are beginning to form.Which period of prenatal development is Marisa currently experiencing?
A)fetal
B)embryonic
C)placental
D)germinal

Accepted Answer

The answer of Marisa is at a point in her...

Question 12

Abby and Brittany Hensel __________.
A)share one body from the waist down
B)share one upper body
C)share a heart
D)share a stomach

Accepted Answer

The answer of Abby and Brittany Hensel __________.
A)share one body...

Question 13

Steve was born a male with an extra X chromosome on the 23^rd pair.As a result,he has reduced masculine characteristics,enlarged breasts,obesity,and excessive height.Which disorder is likely to be diagnosed? A)PKU B)Down C)Klinefelter's D)Turner's

Accepted Answer

Klinefelter's syndrome is a genetic disorder where a male is born with an extra X chromosome, resulting in reduced masculine characteristics, enlarged breasts, obesity, and excessive height. This perfectly matches the symptoms that are described in the given scenario. Therefore, the most likely disorder to be diagnosed in Steve's case is Klinefelter's syndrome.

Question 14

Fraternal twins are __________ similar genetically than are other brothers and sisters.
A)much more
B)no more
C)slightly more
D)much less

Accepted Answer

The answer of Fraternal twins are __________ similar genetically than...

Question 15

Ashley and Elizabeth are twins who are genetically identical.What type of twins are they?
A)monozygotic twins
B)fraternal twins
C)dizygotic twins
D)wombmates

Accepted Answer

Twins who are genetically identical are monozygotic twins, meaning they developed from a single fertilized egg that split into two embryos. The other options (B, C, and D) do not apply because they involve twins who do not have the exact same genetic makeup.

Question 16

Which of the following describes the way in which monozygotic twins occur?
A)The mother's body releases multiple eggs,two or more of which are fertilized.
B)The mother's body releases one egg,conceives,and then releases another egg in a later ovulation cycle.
C)The egg is fertilized by a single sperm and then splits completely into two separate zygotes.
D)The mother uses fertility drugs.

Accepted Answer

Monozygotic twins occur when a fertilized egg, after a few cell divisions, splits completely into two separate zygotes. These zygotes will then develop into two embryos, which will grow and develop as identical twins.

Question 17

Ovum is a term used to describe___________.
A)the female sex cell or egg
B)male sex cell
C)the developing organism from conception to the end of the second week after fertilization
D)the developing organism from 2 to 8 weeks after fertilization

Accepted Answer

Ovum specifically refers to the female sex cell or egg.

Question 18

Humans have a total of _______chromosomes in normal developmental cases.
A)46
B)23
C)21
D)22

Accepted Answer

Humans have a total of 46 chromosomes, divided into 23 pairs. This is known as the diploid number of chromosomes. Each parent contributes 23 chromosomes to their offspring, resulting in a total of 46 chromosomes in normal developmental cases.

Question 19

Brittany and Abby Hensel are ___________.
A)nonidentical twins
B)dizygotic twins
C)fraternal twins
D)conjoined twins

Accepted Answer

Brittany and Abby Hensel are conjoined twins, meaning they are physically connected to each other.

Question 20

Mary and Juan are twins who developed from two separate fertilized ova that were fertilized by two different sperm.What type of twins are they?
A)monozygotic twins
B)maternal twins
C)dizygotic twins
D)wombmates

Accepted Answer

Mary and Juan are dizygotic twins, also known as fraternal twins, because they developed from two separate fertilized ova, each fertilized by a different sperm. Monozygotic twins, on the other hand, develop from one fertilized ovum that splits into two embryos. Maternal twins and wombmates are not recognized terms for describing types of twins.

Quiz 7: Development Across the Life Span

In the process of fertilization the __ and _ unite,resulting in a single cell.

__________develop when two eggs each get fertilized by two different sperm,resulting in two zygotes in the uterus at the same time.

At fertilization,the chromosomes from the father's sperm unite with the chromosomes from the mother's egg,creating a new cell called a(n) ____________.

The union of the ovum and sperm is called__________

Sheila was born a female with only one X chromosome on the 23^rd pair.As a result she is infertile,has difficulty learning,and did not develop breast tissue and rounded hips as her female peers did.Which disorder is likely to be diagnosed?

In _________ syndrome the 23^rd pair of chromosomes is missing an X,resulting in short,infertile females.

The specialized organ that provides nourishment and filters away waste products from the developing baby is called the _________.

The germinal period ___________.

Monozygotic twins ___________.

The placenta is ___________.

Marisa is at a point in her pregnancy when the zygote is moving down her uterus,and the placenta and umbilical cord are beginning to form.Which period of prenatal development is Marisa currently experiencing?

Abby and Brittany Hensel __________.

Steve was born a male with an extra X chromosome on the 23^rd pair.As a result,he has reduced masculine characteristics,enlarged breasts,obesity,and excessive height.Which disorder is likely to be diagnosed?

Fraternal twins are __________ similar genetically than are other brothers and sisters.

Ashley and Elizabeth are twins who are genetically identical.What type of twins are they?

Which of the following describes the way in which monozygotic twins occur?

Ovum is a term used to describe___________.

Humans have a total of _______chromosomes in normal developmental cases.

Brittany and Abby Hensel are ___________.

Mary and Juan are twins who developed from two separate fertilized ova that were fertilized by two different sperm.What type of twins are they?