BIO1201/ BIO 1201 Exam 4: (New 2025/ 2026 Update) | Review with Questions and Verified Answers| 100% Correct| A Grade – LSU

BIO1201/ BIO 1201 Exam 4: (New 2025/
2026 Update) | Review with Questions and
Verified Answers| 100% Correct| A Grade –
LSU


QUESTION
true or false: each sperm has either an X or a Y chromosome and each egg has an X
chromosome?


Answer:
true



QUESTION
what is the mendelian rule of inheritance?


Answer:
one allele is completely dominant to another



QUESTION
what is incomplete dominance?


Answer:
when the heterozygous phenotype is intermediate between the 2 homozygous phenotypes (the
middle ground)



QUESTION
true or false: a single gene may have multiple alleles


Answer:

,true



QUESTION
what is the maximum number of different gene alleles an individual may have?


Answer:
2



QUESTION
what are all the different blood types and their alleles?


Answer:
A (AA or Ao), B (BB or Bo), AB, or O (oo)



QUESTION
what alleles are dominant for blood typing?


Answer:
A and B are dominant to O



QUESTION
do all blood type alleles code for enzymes?


Answer:
yes, but alleles A and B code for enzymes that add different sugar molecules to the ends of
glycoproteins that protrude from red blood cells, whereas allele O codes for a nonfunctional
enzyme that does not add any sugar molecules



QUESTION
what is codominance?

, Answer:
when heterozygotes express the phenotypes of both of the homozygotes
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QUESTION
how does the body determine what type of antibodies to produce?
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Answer:
they make them based on the type of glycoproteins they lack (people with type A blood make B
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kantibodies, people with type B blood make A antibodies, people with type O blood make both A
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kand B antibodies, and people with type AB blood make no antibodies)
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QUESTION
what happens when the wrong blood type is used in a blood transfusion?
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Answer:
the antibodies cause red blood cells that bear foreign glycoproteins to clump together and rupture
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QUESTION
what blood type is the universal donor?
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Answer:
type O blood (because it has no sugars and is not attacked by antibodies in A, B, or AB blood)
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QUESTION
true or false: the environment influences the expression of genes and affects phenotypes
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Answer:
true



QUESTION