LSUE BIOLOGY 1001 EXAMINATION TEST 2026
COMPLETE QUESTIONS AND ANSWERS
◉ How is sex determined in most ants and bees?
A) by the XY system
B) by the ZW system
C) by the number of chromosomes
D) by the size of the sex chromosomes. Answer: C) by the number of
chromosomes
◉ Which of the following terms refers to a situation where a single
phenotypic character is determined by the additive effects of two or
more genes?
A) incomplete dominance
B) codominance
C) pleiotropy
D) polygenic inheritance. Answer: D) polygenic inheritance
◉ Amniocentesis and chorionic villus sampling allows for ____ and
____ of the fetus so that it can be tested for abnormalities
,A) imaging ...karyotyping
B) sexing.... imaging
C) karyotyping... biochemical testing
D) direct observation.. biochemical testing. Answer: D) direct
observation.. biochemical testing
◉ A woman has been trying to conceive for several years,
unsuccessfully. At a fertility clinic, they discover that she has blocked
Fallopian tubes. Using modern technologies, some of her eggs are
removed, fertilized with her husband's sperm, and implanted into
her uterus. The procedure is successful, but the couple discovers
that their son is color blind and the blood type O. The woman claims
that the child can't be theirs since she has blood type A and her
husband has blood type B. Also, neither parent is color blind,
although one grand parent (the woman's father) is also color blind.
As a genetic counselor, you would explain to the parent that
A) the eggs must have been accidentally switched, since the baby's
blood type has to match one of his parents
B) each parent could have contributed one recessive allele, resulting
in type O blood
C) the eggs must have been accidentally switched, since a type A
parent and a ty. Answer: B) each parent could have contributed one
recessive allele, resulting in type O blood
,◉ According to scientist, about what percentage of men currently
living in Central Asia may be descended from the Mongolian ruler
Genghis Khan?
A) 4%
B) 8%
C) 25%
D) 40%. Answer: B) 8%
◉ Which of the following is essentially the opposite of pleiotropy?
A) incomplete dominance
B) codominance
C) multiple alleles
D) polygenic inheritance. Answer: D) polygenic inheritance
◉ The chromosome theory of inheritance states that
A) chromosomes that exhibit mutations are the source of genetic
variation
B) the behavior of chromosomes during meiosis and fertilization
accounts for patterns of inheritance
, C) the behavior of chromosomes during mitosis accounts for
inheritance patterns
D) humans have 46 chromosomes. Answer: B) the behavior of
chromosomes during meiosis and fertilization accounts for patters
of inheritance
◉ The alleles of a gene are found at ______ chromosomes
A) the same locus on non homologous
B) different loci on homologous
C) different loci on non homologous
D) the same locus on homologous. Answer: D) the same locus on
homologous
◉ DNA polymerase
A) joins nucleotides to produce new polymers of RNA
B) reads the RNA strand, and adds the complementary nitrogen
bases to make new RNA strand
C) Stretches the DNA polymers to make new DNA strands
D) joins the two DNA fragments
E) reads the DNA strands, and adds the complementary nucleotides
to amen a new DNA strand. Answer: E) reads the DNA strands, and
adds the complementary nucleotides to amen a new DNA strand
COMPLETE QUESTIONS AND ANSWERS
◉ How is sex determined in most ants and bees?
A) by the XY system
B) by the ZW system
C) by the number of chromosomes
D) by the size of the sex chromosomes. Answer: C) by the number of
chromosomes
◉ Which of the following terms refers to a situation where a single
phenotypic character is determined by the additive effects of two or
more genes?
A) incomplete dominance
B) codominance
C) pleiotropy
D) polygenic inheritance. Answer: D) polygenic inheritance
◉ Amniocentesis and chorionic villus sampling allows for ____ and
____ of the fetus so that it can be tested for abnormalities
,A) imaging ...karyotyping
B) sexing.... imaging
C) karyotyping... biochemical testing
D) direct observation.. biochemical testing. Answer: D) direct
observation.. biochemical testing
◉ A woman has been trying to conceive for several years,
unsuccessfully. At a fertility clinic, they discover that she has blocked
Fallopian tubes. Using modern technologies, some of her eggs are
removed, fertilized with her husband's sperm, and implanted into
her uterus. The procedure is successful, but the couple discovers
that their son is color blind and the blood type O. The woman claims
that the child can't be theirs since she has blood type A and her
husband has blood type B. Also, neither parent is color blind,
although one grand parent (the woman's father) is also color blind.
As a genetic counselor, you would explain to the parent that
A) the eggs must have been accidentally switched, since the baby's
blood type has to match one of his parents
B) each parent could have contributed one recessive allele, resulting
in type O blood
C) the eggs must have been accidentally switched, since a type A
parent and a ty. Answer: B) each parent could have contributed one
recessive allele, resulting in type O blood
,◉ According to scientist, about what percentage of men currently
living in Central Asia may be descended from the Mongolian ruler
Genghis Khan?
A) 4%
B) 8%
C) 25%
D) 40%. Answer: B) 8%
◉ Which of the following is essentially the opposite of pleiotropy?
A) incomplete dominance
B) codominance
C) multiple alleles
D) polygenic inheritance. Answer: D) polygenic inheritance
◉ The chromosome theory of inheritance states that
A) chromosomes that exhibit mutations are the source of genetic
variation
B) the behavior of chromosomes during meiosis and fertilization
accounts for patterns of inheritance
, C) the behavior of chromosomes during mitosis accounts for
inheritance patterns
D) humans have 46 chromosomes. Answer: B) the behavior of
chromosomes during meiosis and fertilization accounts for patters
of inheritance
◉ The alleles of a gene are found at ______ chromosomes
A) the same locus on non homologous
B) different loci on homologous
C) different loci on non homologous
D) the same locus on homologous. Answer: D) the same locus on
homologous
◉ DNA polymerase
A) joins nucleotides to produce new polymers of RNA
B) reads the RNA strand, and adds the complementary nitrogen
bases to make new RNA strand
C) Stretches the DNA polymers to make new DNA strands
D) joins the two DNA fragments
E) reads the DNA strands, and adds the complementary nucleotides
to amen a new DNA strand. Answer: E) reads the DNA strands, and
adds the complementary nucleotides to amen a new DNA strand
