L15 QZ

If an allele for tall (T) is dominant to an allele for short (t), what proportion of the progeny will be short in the following cross: Tt × Tt? 0/4 1/4 2/4 3/4 4/4

1/4

In Mendel's peas, yellow seeds are dominant to green. A pure-breeding yellow plant is crossed with a pure-breeding green plant. All of the offspring are yellow. If one of these yellow offspring is crossed with a green plant, what will be the expected proportion of plants with green seeds in the next generation? 0% 25% 50% 75% 100%

50

Individual #1 with phenotype "A" is test-crossed and half of the offspring produced have phenotype "A" and half have phenotype "a." What are the genotypes of the individuals that were crossed? AA and aa Aa and aa Aa and Aa AA and Aa

Aa and aa

In Mendel's pea plants, how did he know that each F1 generation contained two alleles encoding different characteristics? The F1 generation had a blended phenotype of the two parental phenotypes. Both parental phenotypes reappeared in the F2 generation. Each F1 plant had a different phenotype. The F1 plants did not have two alleles. None of the above.

Both parental phenotypes reappeared in the F2 generation

Which of the following was not one of Mendel's conclusions based on his monohybrid crosses? Genes are carried on chromosomes. Genes exist in pairs. Members of a gene pair segregate equally into gametes. Genes behave as genetic factors during inheritance. One member of a gene pair can mask the expression of the other member.

Genes are carried on chromosomes.

Why was the pea plant an ideal plant for Mendel to use? It produces few progeny. It has some traits, which are easy to be observed. It requires cross-fertilization; there is no self-fertilization. It requires several seasons to complete a generation. There were only a few pure varieties available.

It has some traits, which are easy to be observed.

An animal's black coat color (B) is dominant to brown (b). If a black individual is mated with a brown one and the offspring are 3 black and 2 brown puppies. What can you conclude about the genotype of the black parent? The genotype must be BB. The genotype must be bb. The genotype must be Bb. The genotype could be either BB or Bb. The genotype cannot be determined from this data.

The genotype must be Bb

Mendel determined that for a given character, such as pea seed shape, an individual has two factors and that these can exist in two forms (R or r). Today we would describe R and r as being: different genes of the seed shape locus. different loci of the seed shape gene. different alleles of the seed shape locus. different genotypes of the seed shape character. different traits of the seed shape character.

different alleles of the seed shape locus.

An organism has the genotype Rr and the phenotype R. This is known as the concept of : segregation dominance recessive Mendel hybridization

dominance

In Mendel's peas, purple flower color is dominant to white. From which of the following phenotype or descriptions you can NOT infer the genotype for the locus completely? purple white pure-breeding purple heterozygous More than one of the above.

purple