Question 1

What simple type of cross that investigates the inheritance of only one trait could be used to illustrate Mendel's law of segregation?

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Question 2

In a cross between individuals who are both heterozygous (carriers)for a recessive disease such as albinism, you would like to determine the risk of one or more children to inherit the recessive phenotype. Which of the rules of probability can be used to calculate the probability of a particular combination of events that each have two alternative outcomes?

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Question 3

Why did Mendel cut off the nascent anthers during the process of artificial cross-fertilization?

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Question 4

What is the probability of rolling two six-sided dice and obtaining two 4's?

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Question 5

What is the probability of rolling two six-sided dice and obtaining at least one 3?

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Question 6

What is the probability of rolling two six-sided dice and obtaining an odd number on at least one die?

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Question 7

In the accompanying figure, the chance that individual III-2 is a heterozygous carrier is __________.

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Question 8

In the accompanying figure, the chance that individual IV-7 is a heterozygous carrier is __________.

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Question 9

When calculating the probability of a given genotype in a trihybrid cross, you can generate a Punnett square. Which of the rules of probability can be used to calculate the joint probability of simultaneous inheritance of multiple alleles?

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Question 10

In rabbits, long hair and black fur are produced by the dominant alleles L and B, which assort independently. The genotype ll produces short hair and the genotype bb produces white fur. A cross between a male with short, black fur and a female with long, white fur produces four offspring with short, black fur, four offspring with long, white fur, four offspring with short, white fur, and four offspring with long, black fur. What are the genotypes of the parents?

Accepted Answer

The male with short, black fur must be llBb, and the female with long, white fur must be Llbb. This combination can produce all four phenotypes observed in the offspring.

Question 11

What type of cross would be used to illustrate Mendel's law of independent assortment?

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Question 12

In 1997, a gene called Le was discovered by two research groups led by David Martin and Diane Lester. Allelic variation in the Le gene, which controls elongation of the plant stem between branches, is responsible for which trait in peas?

Accepted Answer

The Le gene controls elongation of the plant stem between branches, which ultimately determines the height of the plant. Therefore, allelic variation in this gene is responsible for the tall and short plant height trait in peas.

Question 13

In a test cross, a pure-breeding plant is crossed with a plant suspected to be heterozygous (Aa). What is the genotype of the pure-breeding plant?

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Question 14

What is the probability of rolling one six-sided die and obtaining a 1 or a 2?

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Question 15

A cross between a short pea plant and a tall pea plant results in a 1:1 genotypic and phenotypic ratio in the offspring. What are the genotypes of the parent plants?

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Question 16

Mendel performed numerous controlled genetic crosses to obtain strains that consistently produced a single phenotype without variation. What are these strains that consistently produce the same phenotype called?

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Question 17

If an affected individual is born to parents who are unaffected, what is the likely mode of inheritance?

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Question 18

What is the probability of rolling one six-sided die and obtaining any number but 6?

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Question 19

The gene L determines hair length in rabbits. The gene B determines hair color. A rabbit with long, black hair is crossed to a rabbit with short, white hair. All the offspring have long, black hair. What are the genotypes of the parents?

Accepted Answer

The offspring all have long, black hair, indicating that long hair (L) and black hair (B) are dominant traits. The parent with long, black hair must be homozygous dominant (LLBB) to ensure all offspring have these traits, while the other parent must be homozygous recessive (llbb) for short, white hair.

Question 20

You count 1000 F₂ seeds from a monohybrid cross. How many do you expect to display the dominant phenotype?

Accepted Answer

In a monohybrid cross, the ratio of dominant to recessive phenotypes is 3:1. This means that out of every 4 seeds, 3 will display the dominant phenotype and 1 will display the recessive phenotype. Therefore, if we count 1000 seeds, we can expect 750 to display the dominant phenotype (3/4 x 1000 = 750).

Quiz 2: Transmission Genetics

What simple type of cross that investigates the inheritance of only one trait could be used to illustrate Mendel's law of segregation?

Why did Mendel cut off the nascent anthers during the process of artificial cross-fertilization?

What is the probability of rolling two six-sided dice and obtaining two 4's?

What is the probability of rolling two six-sided dice and obtaining at least one 3?

What is the probability of rolling two six-sided dice and obtaining an odd number on at least one die?

In the accompanying figure, the chance that individual III-2 is a heterozygous carrier is __________.

In the accompanying figure, the chance that individual IV-7 is a heterozygous carrier is __________.

When calculating the probability of a given genotype in a trihybrid cross, you can generate a Punnett square. Which of the rules of probability can be used to calculate the joint probability of simultaneous inheritance of multiple alleles?

What type of cross would be used to illustrate Mendel's law of independent assortment?

In 1997, a gene called Le was discovered by two research groups led by David Martin and Diane Lester. Allelic variation in the Le gene, which controls elongation of the plant stem between branches, is responsible for which trait in peas?

In a test cross, a pure-breeding plant is crossed with a plant suspected to be heterozygous (Aa). What is the genotype of the pure-breeding plant?

What is the probability of rolling one six-sided die and obtaining a 1 or a 2?

A cross between a short pea plant and a tall pea plant results in a 1:1 genotypic and phenotypic ratio in the offspring. What are the genotypes of the parent plants?

Mendel performed numerous controlled genetic crosses to obtain strains that consistently produced a single phenotype without variation. What are these strains that consistently produce the same phenotype called?

If an affected individual is born to parents who are unaffected, what is the likely mode of inheritance?

What is the probability of rolling one six-sided die and obtaining any number but 6?

The gene L determines hair length in rabbits. The gene B determines hair color. A rabbit with long, black hair is crossed to a rabbit with short, white hair. All the offspring have long, black hair. What are the genotypes of the parents?

You count 1000 F2 seeds from a monohybrid cross. How many do you expect to display the dominant phenotype?

You count 1000 F₂ seeds from a monohybrid cross. How many do you expect to display the dominant phenotype?