Question 1

A different form of an allele at a particular locus that can have no effect to major effects on the phenotype is a/an ________.

Accepted Answer

A)   allelic variant
B)   mutated allele
C)   polymorphism
D)   All of the choices are correct.E) None of the above
F) A) and B)

Question 2

Which of the following statements about the syncytiotrophoblast is false?

Accepted Answer

A)   It forms the developing embryo.
B)   It is composed of a nondividing, multinucleated cell.
C)   It is nonantigenic, so that it triggers no immune response.
D)   It invades the maternal tissues that compose the endometrium of the uterus.
E)   It forms lacunae.F) B) and D)
G) C) and E)

Question 3

The major organ systems develop during the germinal prenatal period.

Accepted Answer

A) True 
 B)False

Question 4

Which germ layer are the bones (except facial)  derived from?

Accepted Answer

A)   Ectoderm
B)   Mesoderm
C)   EndodermD) None of the above
E) All of the above

Question 5

The common junction of the digestive, urinary, and genital systems is the ________.

Accepted Answer

A)   cloaca
B)   coelom
C)   allantois
D)   hindgut
E)   anusF) C) and D)
G) A) and B)

Question 6

Mendel suggested that gene pairs segregate during gamete formation. This process occurs during ________ of meiosis.

Accepted Answer

A)   anaphase I
B)   anaphase II
C)   metaphase I
D)   metaphase IIE) A) and B)
F) A) and C)

Question 7

A cleft lip results when

Accepted Answer

A)   the two halves of the secondary palate do not fuse.
B)   the frontonasal and maxillary processes do not fuse.
C)   the lateral edges of the nasal placodes do not fuse with the maxillary processes.
D)   the maxillary processes do not fuse with the mandibular processes.
E)   None of the choices are correct.F) All of the above
G) B) and C)

Question 8

One component of brain death is defined as ________.

Accepted Answer

A)   loss of reflexes.
B)   lack of spontaneous movement.
C)   a flat electroencephalogram (EEG) .D) All of the above
E) A) and B)

Question 9

Gastrulation is the process of development that produces the ________.

Accepted Answer

A)   placenta
B)   embryonic disk
C)   germ layers
D)   rudimentary organsE) A) and C)
F) A) and B)

Question 10

Which of the following conditions might result in stress on a fetus that has nearly completed 9 months of fetal development?

Accepted Answer

A)   Placental growth greater than fetal growth
B)   Cramped quarters in the uterus
C)   Increased O2 supply to the fetus
D)   Excessive weight gain by the mother
E)   Hormone fluctuationsF) C) and D)
G) B) and E)

Question 11

Which of the following characterizes the developmental age of an eight-month-old infant?

Accepted Answer

A)   Sits without support
B)   Rolls from its back to its side
C)   Smiles in response to people's faces
D)   Pulls itself up to a standing position
E)   None of the choices are correct.F) D) and E)
G) A) and C)

Question 12

In males, the urogenital folds close over the urogenital opening and urethral groove to form the ________.

Accepted Answer

A)   scrotum
B)   testes
C)   vas deferens
D)   penis
E)   prostate glandF) C) and E)
G) A) and E)

Question 13

The eyes develop as evaginations from the ________.

Accepted Answer

A)   myelencephalon
B)   mesencephalon
C)   neural crest cells
D)   diencephalon
E)   telencephalonF) B) and E)
G) A) and E)

Question 14

A mutation involving a single nucleotide is a ________ mutation.

Accepted Answer

A)   deletion
B)   duplication
C)   nondisjunction
D)   point
E)   aneuploidyF) B) and C)
G) A) and E)

Question 15

Only autosomal trisomies involving chromosomes 13, 18, and 21 are survivable. Why would this be?

Accepted Answer

A)   These are relatively short chromosomes.
B)   These are relatively long chromosomes.
C)   These are relatively gene-poor chromosomes.
D)   These are redundant chromosomes.
E)   These chromosomes have no genes.F) A) and D)
G) A) and E)

Question 16

Which of the following is not a reason muscular weakness tends to develop in old age?

Accepted Answer

A)   Aged muscle has less glycogen, myoglobin, and creatine phosphate.
B)   There are fewer motor neurons in the spinal cord.
C)   Aged muscle fibers have fewer myofibrils.
D)   There are fewer and smaller mitochondria in aged muscle.
E)   The muscle fibers of aged muscle no longer synthesize myosin.F) B) and C)
G) None of the above

Question 17

An APGAR score of ________ is considered normal at 1 to 5 minutes after birth.

Accepted Answer

A)   2
B)   5
C)   9
D)   12
E)   25F) B) and C)
G) B) and D)

Question 18

One reason for the increased incidence of cancer with aging is a decrease in ________.

Accepted Answer

A)   urine output
B)   cardiac output
C)   red blood cells
D)   functioning of T lymphocytes
E)   functioning neutrophilsF) B) and E)
G) B) and D)

Question 19

Which of the following major events of prenatal development happens first?

Accepted Answer

A)   The eyes are fully open.
B)   The body is covered with lanugo.
C)   Bone calcification begins.
D)   The central nervous system begins to form.
E)   Meconium accumulates in the intestines.F) A) and E)
G) D) and E)

Question 20

When the dominant allele does not completely mask the effects of the recessive allele in the heterozygote, it is called ________.

Accepted Answer

A)   dominance
B)   polygenic dominance
C)   codominance
D)   incomplete dominance
E)   corecessiveF) A) and C)
G) B) and D)

Exam 29: Development, Growth, Aging, and Genetics

Only autosomal trisomies involving chromosomes 13, 18, and 21 are survivable. Why would this be?

Correct AnswerverifiedShow Answer

Which of the following characterizes the developmental age of an eight-month-old infant?

Correct AnswerverifiedShow Answer

A mutation involving a single nucleotide is a ________ mutation.

Correct AnswerverifiedShow Answer

The common junction of the digestive, urinary, and genital systems is the ________.

Correct AnswerverifiedShow Answer

Which of the following is not a reason muscular weakness tends to develop in old age?

Correct AnswerverifiedShow Answer

Gastrulation is the process of development that produces the ________.

Correct AnswerverifiedShow Answer

Which of the following statements about the syncytiotrophoblast is false?

Correct AnswerverifiedShow Answer

The eyes develop as evaginations from the ________.

Correct AnswerverifiedShow Answer

One reason for the increased incidence of cancer with aging is a decrease in ________.

Correct AnswerverifiedShow Answer

A cleft lip results when

Correct AnswerverifiedShow Answer

A different form of an allele at a particular locus that can have no effect to major effects on the phenotype is a/an ________.

Correct AnswerverifiedShow Answer

Mendel suggested that gene pairs segregate during gamete formation. This process occurs during ________ of meiosis.

Correct AnswerverifiedShow Answer

Which of the following conditions might result in stress on a fetus that has nearly completed 9 months of fetal development?

Correct AnswerverifiedShow Answer

In males, the urogenital folds close over the urogenital opening and urethral groove to form the ________.

Correct AnswerverifiedShow Answer

The major organ systems develop during the germinal prenatal period.

Correct AnswerverifiedShow Answer

An APGAR score of ________ is considered normal at 1 to 5 minutes after birth.

Correct AnswerverifiedShow Answer

Which germ layer are the bones (except facial) derived from?

Correct AnswerverifiedShow Answer

Which of the following major events of prenatal development happens first?

Correct AnswerverifiedShow Answer

One component of brain death is defined as ________.

Correct AnswerverifiedShow Answer

When the dominant allele does not completely mask the effects of the recessive allele in the heterozygote, it is called ________.

Correct AnswerverifiedShow Answer

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