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