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Primavera Biology B Unit 1. Genetics Questions and Answers Latest Updated
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Primavera Biology B Unit 1. Genetics
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Primavera Biology B Unit 1. GeneticsCHECKPOINT 01 - answer
Some people have dimples; other people do not. Having dimples is dominant over not
having dimples.
If the allele for having dimples is represented with the letter D, what allele combinations
can result in having dimples? – answer DD, Dd
Which statement is true about model organisms? - answer They help scientists
understand biological processes.
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 When the phenotype is tall, the genotype can either be
TT or Tt.
The genotype Tt always results in a phenotype that is tall.
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.
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%
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.
Which term defines a genotype composed of two identical alleles? -
answerhomozygous
What statement is true about heterozygous organisms? - answerHeterozygous
organisms are more genetically diverse than homozygous organisms.
CHECKPOINT 02 - answer
Which statement best describes a monohybrid cross? - answera cross in which the
traits of a single characteristic 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.
https://assets.learnosity.com/organisations/625/asset/media/1159909
What is the probability that the offspring will have green seeds? - answer100 percent
In the Punnett square, tall is dominant (T), and short is recessive (t).
https://assets.learnosity.com/organisations/625/asset/media/1159910
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. - answerStatistical and probability methods can be used to
determine how likely an offspring is to inherit certain traits.
Inheritance of one trait does not affect inheritance of another.
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.
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