BIO 131 Test 2 Quizzes Latest 2026 With Answers
A testcross is performed to determine if a specific individual is a carrier. The results
generate a 50/50 ratio of phenotypes. The test subject is therefore
Heterozygous
Assuming Complete Dominance, What is the expected ratio of gemotypes of the offspring
following the cross
1:2:1
If genes are described as "sex linked," then they are ________.
Typically on the X Chromosome
Chromosomes are often represented as an X, with two sister chromatids attached at the
centromere. Do chromosomes always look like an X.
No, Chromosomes only look like an X following DNA replication, and before cell division; the
rest of the time, they only have one sister chromatid each.
What is a carrier?
An individual that is healthy but carries one disease-causing recessive allele
Albinism is a recessive disorder in which the skin ad hair fail to produce pigment. The
following question(s) ask you to evaluate the pedigree chart shown here in which "N" is the
allele for normal pigmentation and "n" is the allele for albinism. The shaded circles for
Deirdre and Shannon represent the only individuals expressing the disorder.
Nn
, According to the pedigree above, who is a not a carrier of albino?
All of the above are carriers of albino
Which of the following is the correct sequence of events during mitosis?
Nuclear membrane dissolves, chromosomes line up, chromosomes split, nuclear membrane
forms
9. Cell theory states that
(this was hard to read)
all life is made up of cells
10) DNA phase is recessive polymerase is called (i couldnt read this question it says DNA p..
is .. p is called a )
chromosome
11. What leads to an individual having too many or too few chromosomes?
Nondisjunction
12.what is a karyotype?
A picture of all the chromosomes in one persons complete set
13. Genes are located in
chromosomes
14. Cells spend most of their time in what phase
interphase
A testcross is performed to determine if a specific individual is a carrier. The results
generate a 50/50 ratio of phenotypes. The test subject is therefore
Heterozygous
Assuming Complete Dominance, What is the expected ratio of gemotypes of the offspring
following the cross
1:2:1
If genes are described as "sex linked," then they are ________.
Typically on the X Chromosome
Chromosomes are often represented as an X, with two sister chromatids attached at the
centromere. Do chromosomes always look like an X.
No, Chromosomes only look like an X following DNA replication, and before cell division; the
rest of the time, they only have one sister chromatid each.
What is a carrier?
An individual that is healthy but carries one disease-causing recessive allele
Albinism is a recessive disorder in which the skin ad hair fail to produce pigment. The
following question(s) ask you to evaluate the pedigree chart shown here in which "N" is the
allele for normal pigmentation and "n" is the allele for albinism. The shaded circles for
Deirdre and Shannon represent the only individuals expressing the disorder.
Nn
, According to the pedigree above, who is a not a carrier of albino?
All of the above are carriers of albino
Which of the following is the correct sequence of events during mitosis?
Nuclear membrane dissolves, chromosomes line up, chromosomes split, nuclear membrane
forms
9. Cell theory states that
(this was hard to read)
all life is made up of cells
10) DNA phase is recessive polymerase is called (i couldnt read this question it says DNA p..
is .. p is called a )
chromosome
11. What leads to an individual having too many or too few chromosomes?
Nondisjunction
12.what is a karyotype?
A picture of all the chromosomes in one persons complete set
13. Genes are located in
chromosomes
14. Cells spend most of their time in what phase
interphase
