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Biology B - primavera Questions and Answers 2024
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Biology B - primavera
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Biology B - primaverawhich statement is true about recessive traits ? - answer Recessive traits can only be
expressed with recessive alleles
replace X and Y with the correct answers
x is the genetic makeup of an organism , as determined by the alleles , while Y is the
observable form - answerx : genotype
y : phenotype
read the statement :
When Mendel crossed a purple-flowered pea plant with a white-flowered pea plant , the
offspring always gad purple flowers , when Mendel crossed the offspring with each
other , the second-generation offspring had some white-flowered plants .
what conclusion can be drawn from this observation ? - answer there is a chance that
any second-generation plant will be a white-flowered one .
which statement defines heterozygous ? - answera genotype composed of two different
alleles
some people have dimples ; other people do not . Having dimples is dominant over not
having dimples .
if the alleles for having dimples is represented with the letter D , what allele
combinations can result in having dimples - answerDD , Dd
which statement is true about model organisms ? - answerthey help scientists
understand biological processes
Read the statement :
When Mendel crossed a purple-flowered pea plant with a white-flowered pea plant , the
offspring were always X . When Mendel crossed the offspring with each other , the
distribution was about Y purple and Z white . The more experiments Mendel did with
pea plants , the closer they approached these percentages .
Which option correctly replaces X , Y , and Z in the statement ? - answerx : purple
y : 75%
z : 25%
A pea plant that is tall has a dominant trait . Which statements are true about the
genotype / phenotype relationship of the plant ?
Select all that apply . - answer- The genotype Tt always results in a phenotype that is
tall .
- When the phenotype is tall , the genotype can either be TT or Tt .
,What statement would be true according to the theory of blending inheritance ? -
answerThe offspring of a tall parent plant and a short parent plant will all have a height
in the middle .
Mendel crossed a tall pea plant with a short pea plant . All the offspring in the first
generation were tall pea plants .
How did Mendel explain why all the offspring were tall pea plants ? - answerTwo factors
affect the height trait of pea plants . One of the factors is dominant over the other .
In some situations , when two purple-flowered pea plants reproduce , the offspring can
have purple or white flowers . When this experiment is run repeatedly , it is discovered
that three-fourths of the offspring have purple flowers and one-fourth of the offspring
have white flowers .
What would happen if this experiment were run only once ? - answerThe experiment
would result in a plant with either purple or white flowers . The conclusion would depend
on this single result and would not be accurate .
What statement is true about heterozygous organisms ? - answerHeterozygous
organisms are more genetically diverse than homozygous organisms.
A type of insect can be red or black . Red is the dominant trait and is represented by a
capital R . Identify the Punnett square that illustrates all offspring being homozygous
recessive for a trait . - answerall lowercase r
Parent A is homozygous dominant for curly hair , and Parent B is homozygous
recessive for straight hair .
What is the expected phenotype of the offspring ? - answercurly hair
What can be shown by a dihybrid cross experiment ? - answerThe inheritance of one
trait does not affect the chance of inheriting another .
A dihybrid cross experiment produces offspring of four different types in the F2
generation . What is the predicted ratio of the four phenotypes in the offspring ? -
answer9:3:3:1
Which statement best describes a monohybrid cross ? - answera cross in which traits of
several different characteristics are studied
Twenty-five percent of the possible offspring for a cross are homozygous dominant .
What genotype do each of the parents have ? - answerheterozygous
In pea plants , green seeds are dominant (Y) , and yellow seeds are recessive (y) . The
following Punnett square shows a cross for seed color . - answer100 percent
What is the ratio of tall offspring to short offspring ? - answer3:1
,What valuable information was gained from Mendel's dihybrid crosses ?
Select all that apply . - answerinheritance of one trait does not affect inheritance of
another .
statistical and probability methods can be used to determine how likely an offspring is to
inherit certain traits .
Dihybrid cross experiments led Mendel to propose his law of independent assortment .
Which statement best describes this law ? - answerthe law of independent assortment
states that alleles of different genes are inherited independently of each other .
Read the following statement .
A dihybrid cross experiment is carried out in pea plants . The traits being observed are
flower color and stem length . In the F2 generation , 81 plants have purple flowers and
long stems , 27 plants have purple flowers and short stems , 27 plants have white
flowers and long stems , and 3 plants have white flowers and short stems .
Which traits are recessive ? - answerwhite flowers , short stem
A dihybrid cross experiment is carried out in pea plants . Which statements are true ?
Select all that apply . - answerthe f1 generation will all have both dominant phenotypes .
the f2 generation will be a mixture of four different phenotypes .
A scientist is studying two traits on a fruit fly . She discovers that these are most often
inherited together .
What can be said about these traits ? - answerThey are on the same chromosome and
are linked together .
why might a Punnett square predicting the results of a dihybrid cross give incorrect
results ? - answerThe two genes are on the same chromosome, making some
combinations less likely than others .
which is an example of the environment affecting gene expression ? - answersome
genes being turned off in warm temperatures
In which situation are you likely to find a trait with only one allele ? - answergenes found
in the DNA of the mitochondria
Multiple alleles for a gene exist in a population . Which of these statements describes
how alleles are inherited ? - answerAn individual can only inherit two alleles for a gene .
Which of the following facts was unknown to Gregor Mendel ? - answeralleles for genes
are found on chromosomes
Why are linked traits inconsistent with Mendel's laws ? - answerlinked traits are likely to
be inherited together. this is not consistent with mendel's law of independent
assortment.
, What is an effect that results when two genes are located side by side on the same
chromosome ? - answerPunnett squares can give incorrect predictions of inheritance.
What statement is true ? - answera diploid organism most often has two alleles for a
trait.
What is epistasis ? - answertraits where one gene interferes with the effect of another
What is an example of an environmental effect on phenotype ? - answerthe gender of
sea turtles being affected by the temperature
How many alleles are typically found for mitochondrial genes ? - answer1
Which of these are genes that have more than two alleles ? - answerthe c gene for
melanin production in rabbit coats
Multiple alleles for a gene make populations more diverse .
What are the benefits of this ? Select all that apply . - answerit makes it more likely that
a population will survive environmental changes .
if a population encounters a new disease , some of the individuals may be immune to it .
Which of the following statements about polygenic inheritance are true ?
Select all that apply . - answerEach gene only contributes a small part to the
phenotype .
When a high number of genes is involved , the number of possible phenotypes is also
high .
What effects can epistasis have on polygenic inheritance ? Select all that apply . -
answera gene can modify the effect of another gene
a gene can mask the effect of another gene
genes can combine to produce entirely new traits
A lab technician observes that the red blood cells in a blood sample display
codominance . What alleles does the person who provided the blood sample have ? -
answeriA and iB
A lab technician observes that the red blood cells in a blood sample have surface
antigen B . What alleles does the person who provided the blood sample have ? -
answeriBiB or iBi
What are characteristics of polygenic traits ?
Select all that apply . - answeron a histogram , traits distribute on a bell-shaped curve
traits are continuous across a range
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