1. Ifa species of flower has the allele R (red) which is incompletelydominant to the allele r (white) what color is the genotype of anindividual with a red flower? Choose as many as areappropriate. (Points: 2) RR
Rr
rr
R
r
2. A gene can be defined as... (Points :2)
alternateforms of the DNA for a trait
geneticcombination that determines the observable form of a trait
partof the DNA that codes for a specific protein
theobservable form of a trait
3. A homozygote is an individual in which(Points : 2)
allelesof the gene pair are different
allelesof the gene pair are identical
genesare homolgous
traitsare passed from parents to progeny
4. Which of the following might be aphenotype? (Points : 2)
A
Aa
pinkflowers
AaDd
5. What does "F2 generation" refer to? (Points: 2)
theparents
theoffspring of the parental generation
theoffspring of crossing the F1 generation with itself
theoffspring of crossing the F1 generation with the parentalgeneration
6. Which of the following genotypes isheterozygous? (Points : 2)
Aa
AABB
A
a
7. Which statement best describes a dominantallele? (Points : 2)
theallele expressed in the homozygote
theallele expressed in the heterozygote
theallele that is most common in the population
theallele that is lethal
8. In a monohybrid cross, if genotype AA iscrossed with genotype aa what will the ratio of genotypes be?(Points : 2)
0AA:1 Aa:0 aa
1AA:2 Aa:1 aa
1AA: 1 aa
1AA:1 Aa:1 aa
9. Leaf color is controlled by 2 alleles whereA (green) is dominant to a (yellow). Leaf shape is controlled by 2alleles where B (round) is dominant to b (heart-shaped). If oneparent's genotype is AABB what is its phenotype? (Points : 2)
green,round leaves
green,heart-shaped leaves
yellow,round leaves
yellow,heart-shaped leaves
10. Leaf color is controlled by 2 alleleswhere A (green) is dominant to a (yellow). Leaf shape is controlledby 2 alleles where B (round) is dominant to b (heart-shaped). Ifthe genotype AaBb is crossed with the genotype AaBb what will theratio of phenotypes be? (Points : 3)
1green, round: 1 green, heart: 1 yellow, round: 1 yellow,heart
1green, round: 2 green , heart: 2 yellow, round: 1 yellow,heart
9green, round: 3 green, heart: 3 yellow, round: 1 yellow,heart
9AABB: 3 Aabb: 3 aaBb: 1 aabb
1. Ifa species of flower has the allele R (red) which is incompletelydominant to the allele r (white) what color is the genotype of anindividual with a red flower? Choose as many as areappropriate. (Points: 2) RR
Rr
rr
R
r
geneticcombination that determines the observable form of a trait partof the DNA that codes for a specific protein theobservable form of a trait |
allelesof the gene pair are identical genesare homolgous traitsare passed from parents to progeny |
Aa pinkflowers AaDd |
theoffspring of the parental generation theoffspring of crossing the F1 generation with itself theoffspring of crossing the F1 generation with the parentalgeneration |
AABB A a |
theallele expressed in the heterozygote theallele that is most common in the population theallele that is lethal |
1AA:2 Aa:1 aa 1AA: 1 aa 1AA:1 Aa:1 aa |
green,heart-shaped leaves yellow,round leaves yellow,heart-shaped leaves |
| 10. Leaf color is controlled by 2 alleleswhere A (green) is dominant to a (yellow). Leaf shape is controlledby 2 alleles where B (round) is dominant to b (heart-shaped). Ifthe genotype AaBb is crossed with the genotype AaBb what will theratio of phenotypes be? (Points : 3) |
1green, round: 2 green , heart: 2 yellow, round: 1 yellow,heart
9green, round: 3 green, heart: 3 yellow, round: 1 yellow,heart
9AABB: 3 Aabb: 3 aaBb: 1 aabb
Related textbook solutions
Related questions
1. Characters that show a continuous range of variation, such as height and eye color, usually are controlled:
| a. | by a single gene with two alleles that are codominant. |
| b. | by many genes with an additive effect. |
| c. | by epistatic interactions between two genes. |
| d. | mainly by the environment, with only a small genetic component. |
2. In humans, red-green colorblindness is inherited as a sex-linked recessive trait. In order for a woman to be red-green colorblind, which of the following statements must be true.
| a. | Her mother must be red-green colorblind. |
| b. | All of her brothers must be red-green colorblind. |
| c. | Her father must be red-green colorblind. |
| d. | All of the above statements must be true if a woman is red-green colorblind. |
3. The x-ray crystallography data collected by Rosalind Franklin suggested to Watson and Crick that the:
| a. | structure of DNA is a double helix. |
| b. | two strands of the DNA molecule are joined by hydrogen bonds between the bases. |
| c. | four bases within DNA pair in a specific way. |
| d. | two strands of the DNA molecule are joined by covalent bonds between the bases. |
4. In the genetic code, _________ one amino acid.
| a. | one nucleotide specifies |
| b. | two nucleotides specify |
| c. | three nucleotides specify |
| d. | four nucleotides specify |
5. During Meiosis I, a homologous pair of chromosomes may not separate, resulting in daughter cells that have extra chromosomes or are missing chromosomes. This can lead to genetic disorders, including Down Syndrome. This phenomenon is called:
| a. | independent assortment. |
| b. | nondisjunction. |
| c. | segregation. |
| d. | crossing over. |
6. You are a human geneticist studying the incidence of retinitis pigmentosa in the residents of Tristan de Cunha, a group of small islands in the middle of the southern Atlantic Ocean. The allele for retinitis pigmentosa, which causes a form of blindness, is inherited as an autosomal recessive. You have determined that the frequency of this allele (r) in the population is 0.4 (40%). Using the principles of the Hardy-Weinberg rule, you would estimate the frequency of individuals who are heterozygous for this allele (Rr) in the population to be:
| a. | 0.16 (16%) |
| b. | 0.24 (24%) |
| c. | 0.36 (36%) |
| d. | 0.48 (48%) |
7. Natural selection acts at the level of the:
| a. | phenotype. |
| b. | gene. |
| c. | population. |
| d. | nucleotide. |
8. You are working with pea plants, trying to recreate the experiments that Mendel performed. You are doing a dihybrid cross with a plant that is heterozygous for both seed shape and seed color, with the genotype RrYy. Which allelic combinations would you expect to find in the gametes produced by this plant?
| a. | This plant would produce only RY and ry gametes. |
| b. | This plant would produce only RrYy gametes. |
| c. | This plant would produce RY, Ry, rY, and ry gametes. |
| d. | You cannot determine which gametes this plant can produce without knowing the genotypes of its parents. |
9. Biochemist Erwin Chargaff found that in DNA there is a special relationship between the four bases that we now call Chargaff's rule. His observation was that, in an organism's genome the:
| a. | percentage of A nucleotides = the percentage of T nucleotides, and the percentage of C nucleotides = the percentage of G nucleotides. |
| b. | four bases all occur in an equal frequency (25%) within each organism. |
| c. | percentage of A nucleotides = the percentage of G nucleotides, and the percentage of C nucleotides = the percentage of T nucleotides. |
| d. | genetic material is composed of proteins, not DNA. |
10. During DNA replication:
| a. | each strand of the double helix acts as a template for the synthesis of a new strand. |
| b. | the enzyme DNA polymerase adds nucleotides to the strand being synthesized. |
| c. | the bases A,C,G and T are required. |
| d. | All of the above are true of DNA replication. |
11. During translation, amino acids are joined by peptide bonds to make polypeptides. The formation of these peptide bonds is catalyzed by:
| a. | DNA. |
| b. | mRNA. |
| c. | tRNA. |
| d. | rRNA. |
12. If an allele (R) at a gene with two alleles shows complete dominance, individuals with the genotypes ______ will have the same phenotype.
| a. | RR and rr. |
| b. | RR and Rr |
| c. | Rr and rr |
| d. | Each of the three possible genotypes will have a different phenotype. |
