Question 1

Match between columns
                        Premises: When true-breeding P plants are crossed,all offspring have the trait of one of the parents.
When true-breeding P plants of different types are crossed,the offspring do not have a phenotype intermediate between the two parents.
When two traits are followed in a dihybrid cross,heterozygotes in the F₁ generation produce offspring with all combinations of phenotypes,in a 9:3:3:1 ratio.
The crossing of two true-breeding parents seems to produce a blending in the F₁ generation,but the dominant and recessive traits are expressed again in the F₂ generation.

Accepted Answer

The Answer of Neither allele is completely dominant over the is...

Question 2

Hydrangeas can have either pink or blue flowers.You want to test if the flower color is influenced by the environment,such as the acidity of the soil.Design an experiment to test if soil acidity affects flower color.

Accepted Answer

Take a cutting from a blue hydrangea and...

Question 3

In Mendel's pea plants,yellow seeds are dominant to green seeds.If a true-breeding green-seed-producing plant is crossed to a heterozygous yellow-seed-producing plant,what percentage of offspring produces green seeds?

Accepted Answer

A)  10 percent
B)  50 percent
C)  33 percent
D)  25 percent
E)  100 percent

Question 4

In Mendel's pea plants,yellow seeds are dominant to green seeds.Purple flowers are dominant to white flowers.Use Y and y for the seed color alleles and P and p for the flower color alleles.Flower color and seed color assort independently.A plant of unknown genotype with yellow seeds and purple flowers is crossed to a plant with green seeds and white flowers.The offspring all have yellow seeds,but some have purple flowers,and some have white flowers.What is the genotype of the yellow-seeded,purple-flowered plant?

Accepted Answer

A)  YyPp
B)  YYPp
C)  YyPP
D)  YYPP
E)  Yypp

Question 5

When two individuals with different traits are crossed,either the dominant or the recessive trait,and not an intermediate trait,is always seen,no matter what the organism or phenotype.

Accepted Answer

A) True 
 B)False

Question 6

Characters such as height,weight,and skin color are controlled by many genes acting together.These are examples of:

Accepted Answer

A)  multiple alleles.
B)  codominance.
C)  incomplete dominance.
D)  polygenic inheritance.

Question 7

What is the physical basis for the independent assortment observation that Mendel made?

Accepted Answer

A)  Male and female gametes are produced in separate organs in separate individuals.
B)  Sister chromatids do not separate until meiosis II.
C)  There are two chromosome divisions in meiosis.
D)  Homologous chromosomes are randomly aligned and separated during meiosis.
E)  Recombination (crossing over) occurs in meiosis.

Question 8

When Mendel crossed plants and followed two traits (a dihybrid cross) ,he saw a 9:3:3:1 ratio of traits in the F₂ generation.What did he conclude?

Accepted Answer

A)  The two traits affect each other's transmission.
B)  Dominant traits are always more common than recessive ones.
C)  In meiosis, one allele of each gene is passed to each gamete.
D)  The transmission of one trait is unaffected by the other.

Question 9

Mendel postulated that individuals have genetic elements that exist in pairs,which determine a single phenotype.What do we now know these pairs of elements to be?

Accepted Answer

A)  two haploid sets of chromosomes
B)  two alleles of a gene on homologous chromosomes
C)  pairs of sister chromatids
D)  pairs of centromeres
E)  a sperm and an egg

Question 10

What is the basis of codominance?

Accepted Answer

A)  There is only one allele for a gene.
B)  One allele of a gene encodes a protein, and the other allele is nonfunctional.
C)  One gene has many alleles.
D)  Each allele of a gene produces a protein that functions to create a trait.
E)  One allele can have many effects on a phenotype.

Question 11

Mendel's crosses with pea plants disproved the notion that,when individuals with two different traits are mated,the genetic information blends in the offspring and is not retained as separate elements.

Accepted Answer

A) True 
 B)False

Question 12

In humans,"unattached" earlobes are dominant over "attached" earlobes.Widow's-peak hairline is dominant over non-widow's-peak hairline.Use E and e for the earlobe phenotype alleles and W and w for the hairline phenotype alleles.A woman with unattached earlobes and a widow's peak and a man with attached earlobes and a widow's peak have a child.The child has attached earlobes and a non-widow's-peak hairline.What are the genotypes of the parents?

Accepted Answer

A)  EEWW and eeww
B)  EeWw and eeWw
C)  EEWW and eeWw
D)  EeWw and EeWW
E)  EeWw and eeww

Question 13

Crossing a true-breeding red-flowered snapdragon with a true-breeding white-flowered snapdragon produces all pink snapdragons in the F₁ generation.If F₁ individuals are crossed,what will be the ratio of phenotypes in the F₂ generation?

Accepted Answer

A)  1 red:1 pink: 2 white
B)  2 red:1 pink: 2 white
C)  1 red: 2 pink: 1 white
D)  3 pink: 1 white
E)  3 white: 1 pink

Question 14

When Mendel crossed heterozygotes for flower color and seed color,what proportion of the offspring had both dominant phenotypes?

Accepted Answer

A)  3/4
B)  3/16
C)  1/3
D)  1/16
E)  9/16

Exam 11: The First Geneticist: Mendel and His Discoveries

In Mendel's pea plants,yellow seeds are dominant to green seeds.If a true-breeding green-seed-producing plant is crossed to a heterozygous yellow-seed-producing plant,what percentage of offspring produces green seeds?

Correct Answer
verified

Correct Answer
verified

When Mendel crossed plants and followed two traits (a dihybrid cross) ,he saw a 9:3:3:1 ratio of traits in the F₂ generation.What did he conclude?

Correct Answer
verified

Match the following.

When Mendel crossed heterozygotes for flower color and seed color,what proportion of the offspring had both dominant phenotypes?

Correct Answer
verified

Hydrangeas can have either pink or blue flowers.You want to test if the flower color is influenced by the environment,such as the acidity of the soil.Design an experiment to test if soil acidity affects flower color.

Correct Answer
verified
Take a cutting from a blue hydrangea and...
View Answer

What is the physical basis for the independent assortment observation that Mendel made?

Correct Answer
verified

Characters such as height,weight,and skin color are controlled by many genes acting together.These are examples of:

Correct Answer
verified

Correct Answer
verified

Mendel's crosses with pea plants disproved the notion that,when individuals with two different traits are mated,the genetic information blends in the offspring and is not retained as separate elements.

Correct Answer
verified

Crossing a true-breeding red-flowered snapdragon with a true-breeding white-flowered snapdragon produces all pink snapdragons in the F₁ generation.If F₁ individuals are crossed,what will be the ratio of phenotypes in the F₂ generation?

Correct Answer
verified

What is the basis of codominance?

Correct Answer
verified

When two individuals with different traits are crossed,either the dominant or the recessive trait,and not an intermediate trait,is always seen,no matter what the organism or phenotype.

Correct Answer
verified

Mendel postulated that individuals have genetic elements that exist in pairs,which determine a single phenotype.What do we now know these pairs of elements to be?

Correct Answer
verified

Exam 11: The First Geneticist: Mendel and His Discoveries

In Mendel's pea plants,yellow seeds are dominant to green seeds.If a true-breeding green-seed-producing plant is crossed to a heterozygous yellow-seed-producing plant,what percentage of offspring produces green seeds?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

When Mendel crossed plants and followed two traits (a dihybrid cross) ,he saw a 9:3:3:1 ratio of traits in the F₂ generation.What did he conclude?

Correct AnswerverifiedShow Answer

Match the following.

When Mendel crossed heterozygotes for flower color and seed color,what proportion of the offspring had both dominant phenotypes?

Correct AnswerverifiedShow Answer

Hydrangeas can have either pink or blue flowers.You want to test if the flower color is influenced by the environment,such as the acidity of the soil.Design an experiment to test if soil acidity affects flower color.

Correct AnswerverifiedTake a cutting from a blue hydrangea and...View AnswerShow Answer

What is the physical basis for the independent assortment observation that Mendel made?

Correct AnswerverifiedShow Answer

Characters such as height,weight,and skin color are controlled by many genes acting together.These are examples of:

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Mendel's crosses with pea plants disproved the notion that,when individuals with two different traits are mated,the genetic information blends in the offspring and is not retained as separate elements.

Correct AnswerverifiedShow Answer

Crossing a true-breeding red-flowered snapdragon with a true-breeding white-flowered snapdragon produces all pink snapdragons in the F₁ generation.If F₁ individuals are crossed,what will be the ratio of phenotypes in the F₂ generation?

Correct AnswerverifiedShow Answer

What is the basis of codominance?

Correct AnswerverifiedShow Answer

When two individuals with different traits are crossed,either the dominant or the recessive trait,and not an intermediate trait,is always seen,no matter what the organism or phenotype.

Correct AnswerverifiedShow Answer

Mendel postulated that individuals have genetic elements that exist in pairs,which determine a single phenotype.What do we now know these pairs of elements to be?

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
Take a cutting from a blue hydrangea and...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
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