physio chapter 20 Question and answers
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How many autosomal chromosomes are present in human cells? A. 23 pair
B. 46
C. 22 pair - correct answer 22 pair
What type of genetic change occurs when an allele is silenced by methylation
of cytosine bases?
A. genomic
B. epigenetic
C. mutation - correct answer epigenetic
What type of genes are found on the Y chromosome?
A. X-transposed genes
B. degenerate genes
C. testis-specific genes
D. All of the choices are correct. - correct answer All of the choices are
correct.
Regions of DNA that read the same forward as backward are called ______
and include the testis-specific genes on the Y chromosome. A. palindromes
B. autosomes
C. haploid - correct answer palindromes
A fertilized egg is called a/an
A. autosome.
,B. zygote.
C. ovum. - correct answer zygote.
Which of the following would be found in normal somatic cells of women but
not men?
A. an X chromosome
B. a Y chromosome
C. a Barr body - correct answer a Barr body
What is the principle sex steroid in males?
A. estrogen
B. testosterone
C. progesterone - correct answer testosterone
How many chromosomes are found in a normal human cell?
A. 23
B. 23 pair
C. 46
D. Both 23 pair and 46 are correct. - correct answer Both 23 pair and 46 are
correct.
A lack of testosterone in males will cause the genital tubercle to form a(n)
A. penis.
B. testis.
C. clitoris. - correct answer clitoris.
, The first event to occur during development of the reproductive system would
be the
A. descent of the testes into the scrotum.
B. formation of the vagina.
C. onset of testosterone production.
D. development of the Müllerian ducts. - correct answer development of the
Müllerian ducts.
Testosterone, not DHT, stimulates embryonic development of A. seminal
vesicles.
B. ductus deferens.
C. ejaculatory duct.
D. All of the choices are correct. - correct answer All of the choices are
correct.
Males lacking testosterone receptors would
A. develop as genotypic females.
B. have testes and female external genitalia.
C. lack gonads. - correct answer have testes and female external genitalia.
The embryonic urethral fold becomes the female
A. labia minora.
B. labia majora.
C. glans clitoris. - correct answer labia minora.
Those with testicular feminization syndrome have
A. an extra X chromosome.
rated A+ 2025
How many autosomal chromosomes are present in human cells? A. 23 pair
B. 46
C. 22 pair - correct answer 22 pair
What type of genetic change occurs when an allele is silenced by methylation
of cytosine bases?
A. genomic
B. epigenetic
C. mutation - correct answer epigenetic
What type of genes are found on the Y chromosome?
A. X-transposed genes
B. degenerate genes
C. testis-specific genes
D. All of the choices are correct. - correct answer All of the choices are
correct.
Regions of DNA that read the same forward as backward are called ______
and include the testis-specific genes on the Y chromosome. A. palindromes
B. autosomes
C. haploid - correct answer palindromes
A fertilized egg is called a/an
A. autosome.
,B. zygote.
C. ovum. - correct answer zygote.
Which of the following would be found in normal somatic cells of women but
not men?
A. an X chromosome
B. a Y chromosome
C. a Barr body - correct answer a Barr body
What is the principle sex steroid in males?
A. estrogen
B. testosterone
C. progesterone - correct answer testosterone
How many chromosomes are found in a normal human cell?
A. 23
B. 23 pair
C. 46
D. Both 23 pair and 46 are correct. - correct answer Both 23 pair and 46 are
correct.
A lack of testosterone in males will cause the genital tubercle to form a(n)
A. penis.
B. testis.
C. clitoris. - correct answer clitoris.
, The first event to occur during development of the reproductive system would
be the
A. descent of the testes into the scrotum.
B. formation of the vagina.
C. onset of testosterone production.
D. development of the Müllerian ducts. - correct answer development of the
Müllerian ducts.
Testosterone, not DHT, stimulates embryonic development of A. seminal
vesicles.
B. ductus deferens.
C. ejaculatory duct.
D. All of the choices are correct. - correct answer All of the choices are
correct.
Males lacking testosterone receptors would
A. develop as genotypic females.
B. have testes and female external genitalia.
C. lack gonads. - correct answer have testes and female external genitalia.
The embryonic urethral fold becomes the female
A. labia minora.
B. labia majora.
C. glans clitoris. - correct answer labia minora.
Those with testicular feminization syndrome have
A. an extra X chromosome.
