BIO 133 EXAM 1 QUESTIONS WITH
100% CORRECT ANSWERS LATEST
VERSION 2025/2026.
What is the difference between a gene and an allele? - ANS Genes code for proteins and
alleles are variants of genes
______ is for color of a flower and the ______ is purple or white - ANS Gene ; Allele
Alleles are indicated by ________ _________. - ANS Different sequences
Normal hemoglobin is ___ and mutant hemoglobin is ___ - ANS CTT ; CAT
You receive half of your DNA from each parent but ___________. - ANS each cell in your
body contains genes from both parents
What is a difference between DNA and RNA? - ANS DNA has the sugar deoxyribose and RNA
has sugar ribose
1. RNA's bases are AUGC and DNA's bases are ATGC
2. DNA and RNA have the same phosphate groups
3. DNA is double stranded typically and RNA is single stranded
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,DNA contains the instructions for _______. - ANS proteins
RNA is the ______ _______ needed for construction of proteins - ANS intermediary vehicle
Proteins are formed outside of the nucleus in _________. - ANS ribosomes.
RNA is needed to _____________ from the DNA to the ribosomes - ANS transport the
instuctions
DNA's base pairs are __-__ and __-__ - ANS A-T and C-G
RNA's base pairs are __-__ and __-__ - ANS A-U and C-G
How many chromosomes do humans have in most of their cells? - ANS 46 chromosomes
(sperm 23 + egg 23)
How many chromosomes do humans have in reproductive cells? - ANS 23 chromosomes
An organisms' appearance is it's __________ while the alleles an organism has is it's
__________. - ANS phenotype ; genotype
What are Phenotypes? - ANS how alleles are expressed
What are Genotypes? - ANS the alleles an organism contains
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, How many alleles are in each genotype? - ANS 2 alleles because one comes from each parent
What is a Karyotype? - ANS tool used to view chromosomes
What is wrong with a karyotype that has 3 copies of one chromosome on the 27th
chromosome? - ANS Trisomy 21 and is the most common example of mental retardation
When there is 3 copies of one chromosome, what is the factor that affects life expectancy? -
ANS the amount of genes the specific chromosome contains
(ex. There aren't that many genes on chromosome 21 so this condition is survivable. Although
Trisomy 18 contains many more genes and individuals don't live past a few years)
What could cause a triploid embryo? - ANS 1. A normal egg fertilized by a sperm with 2 of
every chromosome
2. A normal egg fertilized by two sperm
3. An egg that has two of every chromosome fertilized by a normal sperm
Who is considered the "Father of genetics" - ANS Gregor Mendel
What did Mendel study? - ANS studied traits determined by single genes
What kind of genes is the environment referred to as? - ANS multi-factorial genes
Flower color in pea plants and sickle cell anemia in humans are good examples of... -
ANS Mendelian traits
(ex. Phenotype will show an either/or trait. Either the flower color is purple or white, either you
have sickle cell anemia or you do not)
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
100% CORRECT ANSWERS LATEST
VERSION 2025/2026.
What is the difference between a gene and an allele? - ANS Genes code for proteins and
alleles are variants of genes
______ is for color of a flower and the ______ is purple or white - ANS Gene ; Allele
Alleles are indicated by ________ _________. - ANS Different sequences
Normal hemoglobin is ___ and mutant hemoglobin is ___ - ANS CTT ; CAT
You receive half of your DNA from each parent but ___________. - ANS each cell in your
body contains genes from both parents
What is a difference between DNA and RNA? - ANS DNA has the sugar deoxyribose and RNA
has sugar ribose
1. RNA's bases are AUGC and DNA's bases are ATGC
2. DNA and RNA have the same phosphate groups
3. DNA is double stranded typically and RNA is single stranded
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,DNA contains the instructions for _______. - ANS proteins
RNA is the ______ _______ needed for construction of proteins - ANS intermediary vehicle
Proteins are formed outside of the nucleus in _________. - ANS ribosomes.
RNA is needed to _____________ from the DNA to the ribosomes - ANS transport the
instuctions
DNA's base pairs are __-__ and __-__ - ANS A-T and C-G
RNA's base pairs are __-__ and __-__ - ANS A-U and C-G
How many chromosomes do humans have in most of their cells? - ANS 46 chromosomes
(sperm 23 + egg 23)
How many chromosomes do humans have in reproductive cells? - ANS 23 chromosomes
An organisms' appearance is it's __________ while the alleles an organism has is it's
__________. - ANS phenotype ; genotype
What are Phenotypes? - ANS how alleles are expressed
What are Genotypes? - ANS the alleles an organism contains
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, How many alleles are in each genotype? - ANS 2 alleles because one comes from each parent
What is a Karyotype? - ANS tool used to view chromosomes
What is wrong with a karyotype that has 3 copies of one chromosome on the 27th
chromosome? - ANS Trisomy 21 and is the most common example of mental retardation
When there is 3 copies of one chromosome, what is the factor that affects life expectancy? -
ANS the amount of genes the specific chromosome contains
(ex. There aren't that many genes on chromosome 21 so this condition is survivable. Although
Trisomy 18 contains many more genes and individuals don't live past a few years)
What could cause a triploid embryo? - ANS 1. A normal egg fertilized by a sperm with 2 of
every chromosome
2. A normal egg fertilized by two sperm
3. An egg that has two of every chromosome fertilized by a normal sperm
Who is considered the "Father of genetics" - ANS Gregor Mendel
What did Mendel study? - ANS studied traits determined by single genes
What kind of genes is the environment referred to as? - ANS multi-factorial genes
Flower color in pea plants and sickle cell anemia in humans are good examples of... -
ANS Mendelian traits
(ex. Phenotype will show an either/or trait. Either the flower color is purple or white, either you
have sickle cell anemia or you do not)
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
