Biology Week 8
In a BB x bb cross, how many of the offspring are predicted to have a homozygous genotype (BB or bb), out of 20 offspring? Write your answer as a whole number.
0
In a dihybrid cross involving pea plants heterozygous for two traits (RrYy x RrYy), how many of the offspring will be recessive for both traits?
1/16
Pea plants can have two alleles for height: T (tall stem) and t (short stem). Two plants with genotype Tt and tt are crossed, and the 300 resulting seeds are planted. How many of the offspring are predicted to be short? Write your answer as a whole number with no decimals.
150
For each characteristic, an organism inherits _______ alleles.
2
Mendel's law of independent assortment is the result of researching how many characteristics at a time?
2
If AaBb is crossed with aabb, what percentage of the offspring could be expected to be aabb?
25%
When Mendel let the F1 generation self-pollinate, the F2 generation was always represented in a _______ ratio.
3:1
In a Cc x CC cross, how many of the offspring are predicted to show a dominant phenotype out of 4 total offspring? Write your answer as a whole number.
4
In a dihybrid cross involving pea plants heterozygous for two traits (RrYy x RrYy), how many of the offspring will be phenotypically green? Round (R) is dominant over wrinkled (r), and Yellow (Y) is dominant over green (y).
4/16
If separate eyebrows are dominant and unibrows are recessive, what is the probability that the first two children of two heterozygous parents will both have unibrows? Write the answer as a percentage. Keep two decimal places.
6.25
With unlinked genes, a __________ phenotypic ratio will result in the offspring of a cross of two completely heterozygous individuals.
9:3:3:1
Complete the sentence using one of the following words: blending, gene, or cell.
Blending
If brown hair allele is represented with a B, and blonde hair is represented with a b,
Brown hair is dominant
A ________ is a cross in which the inheritance of two characteristics are tracked at the same time.
Dihybrid
Charles Darwin published his theory of evolution a few years after Mendel's discoveries. This allowed him to incorporate Mendel's results and genetics into his theory.
False
Gregor Mendel experimented with maize plants to learn how characteristics are passed from parents to offspring.
False
In Mendel's first experiments, the F1 generation consisted of all white-flowered plants.
False
In Mendel's first set of experiments, both forms of a trait always showed up in F1 plants.
False
Offspring that result from a cross between two different types of parents are called variables.
False
The law of independent assortment is the first law propounded by Mendel.
False
The type of cross in Mendel's first experiment is called a dihybrid cross.
False
To develop his theories, Mendel experimented on almost 290,000 pea plants.
False
Which law states that factors controlling different characteristics are inherited independently of each other?
Law of independent assortment
genes are genes that are inherited because they are located on the same chromosome.
Linked
Mendel's work was at first largely ignored because
Mendel could not propose a mechanism for any of his observed inheritance patterns
Which of the following describes Mendel's understanding of molecular biology?
Mendel did not know of the existence of DNA., Mendel did not understand the concept of the chromosome., Mendel did not understand meiosis.
Which law states that there are two factors controlling a given characteristic, one of which dominates the other, and these factors separate and go to different gametes when a parent reproduces?
Mendel's First Law
Assume you are investigating the inheritance of stem length in pea plants. You cross-pollinate a short-stemmed plant with a long-stemmed plant. All of the offspring have long stems. Then, you let the offspring self-pollinate. Describe the stem lengths you would expect to find in the second generation of offspring.
The F2 would have 75% long-stemmed plants and 25% short-stemmed plants.
Mendel used the garden pea in his experiments for all of the following reasons except:
They undergo self-pollination
'Filial' is a term used to describe offspring in Mendel's experiments.
True
According to Mendel, only one factor for each trait is in each gamete.
True
In his first experiment, Mendel cross-pollinated two true-breeding plants of contrasting traits and continued them over a span of three generations.
True
In the F2 generation, Mendel found all possible combinations of the two characteristics of his pea plants - green and round, green and wrinkled, yellow and round, and yellow and wrinkled.
True
Mendel first experimented with one characteristic of a pea plant at a time.
True
Mendel observed that a tall plant and a short plant had offspring that were either tall or short but not medium in height.
True
Mendel's laws form the basis of the science of genetics
True
Mendel's understanding of mathematics and science was important for his research because it helped make his conclusions much more convincing.
True
Mendel's work was initially rejected as most biologists still believed in blending inheritance.
True
One of Mendel's hypotheses is when two different alleles are inherited together, one may be expressed while the effect of the other may be "silenced".
True
Pea plants show numerous traits that occur in only two forms.
True
The law of segregation is the law which states that two factors controlling a characteristic separate and go to different gametes.
True
The law of segregation states that a pair of alleles is segregated during the formation of gametes and that each gamete has an equal chance of getting either one of the alleles.
True
The scientific name of a pea plant is Pisum sativum.
True
How did Mendel know the F1 generation of pea plants with purple flowers still retained genetic information for white flowers?
When he crossed the F1 generation, white flowers reappeared in their offspring.
If Mendel decides to experiment with chickens , and crosses curly feathered chicken (C) with straight feathered chicken (c), assuming that those chickens are homozygous for genes, the offspring
Will all have curly feathers.
Which of the following is an example of a homozygous individual?
a blue-eyed child with a blue-eyed mother (bb) and brown-eyed (Bb) father
Mendel discovered the law of independent assortment when he performed
a dihybrid cross
The Punnett square below shows
a dihybrid cross
From Mendel's first set of experiments, he concluded that
all of the above are correct
A dominant phenotype of yellow peas has a
cannot be determined by the information
If Katie has brown eyes, a dominant trait, we know
her phenotype but not her genotype
When Mendel crossed pea plants with white flowers and pea plants with purple flowers, the offspring showed
only purple flowers because of the law of dominance
Mendel needed to control the transfer of _______ from one flower to the _______ of the same or another flower.
pollen, stigma
A true-breeding plant is a plant that will always produce offspring with the parental trait when it ________.
self-pollinates
The law of segregation states that during meiosis,
two alleles coding for the same trait will separate
A dihybrid cross occurs when
two organisms involving two different traits are crossed
If the law of segregation was not true, a cross between two heterozygous yellow pea plants
would only produce yellow pea plant offspring