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Biology 1240
General Bio 2: Test 1
| Question | Answer |
|---|---|
| When a pair of alleles for a trait move apart and pass into different gametes, this demonstrates? | Crossing Over |
| On a Monohybrid Cross,a male fly with the genotype "Dd" crosses with a female fly with the genotype "dd". What gamete(s) would the male fly have from this cross? | either D or d |
| An example of the genotype of a diploid pure-breeding (true breeding) organism is: aaBB, AB, AaBB, AABb, more than one | aaBB |
| In daisies, red x white--> pink. What proportion of plant offspring are expected to have pink flowers from the cross pink x red? | 1/2 pink |
| What can control the same trait but may produce different expressions of that trait? | Alleles |
| An allele that isn't expressed when it's paired with a dominant allele is a _____ allele. | Recessive |
| The mating of "AaBb" x "aabb" produces all of the following except:aaBb,AaBb,aabb,AABB,Aabb | AABB |
| A human cell containing 22 autosomes and an X chromosome is? | Egg and/or Sperm |
| Alternative forms of a basic gene that govern the same trait, such as eye color, and occupy corresponding positions on homologous chromosomes? | Alleles |
| The physical appearance of an organism for a given trait is? | Phenotype |
| What is the final product of DNA replication? | 2 DNA molecules, each of which has one new and one old DNA strand |
| What adds new nucleotides to a growing DNA chain? | DNA Polymerase |
| The nerve, blood, and muscle cells of a given individual look & function differently b/c? | Different genes are active in each kind of cell |
| What kind of mutation results in the conversion of an amino acid specifying codon to a termination codon? | Nonsense Mutation |
| The expected F2 genotypic ratio of a monohybrid cross involving complete dominance is | 1:2:1 |
| Breeding a white flower and a red flower that results in a red and white flower is an example of? | Codominance |
| Researchers who first discovered the mechanism of control of a bacterial gene were? | Jacob and Monod |
| A mom has type A blood and the dad has type AB blood. What are the possibl blood types of their children? | A, B, AB |
| One parent is homozygous for red eyes and the other is heterozygous for red eyes. The recessive eye color is blue. Whats the probability that their child will have red eyes? | 100% |
| The sugar lactose induces the synthesis of lactose in E. coli. What would happen when the E. coli runs out of lactose? | The repressor protein binds to the operator |
| Initiation of transcription requires a promoter sequence? T/F | True |
| What is a test cross? | Mating a person expressing a dominant phenotype, but whose genotype is unknown, with a person expressing the corresponding recessive phenotype. |
| The operator of tryptophan synthetase operon in E.Coli is located where? | Between the promoter and structural gene |
| Where is the amino acid binding site on the tRNA molecule? | At the end of the 3' end of the molecule |
| Repressible operon structural genes are usually actively transcribed when | The supply of the repressor is low |
| The inducer molecule of the lactose operon in E.Coli is? | Allolactose |
| What does primase do? | Make short strands of RNA at the sites of replication initiation |
| How many sex chromosomes are present in one of your skin cells? | Two |
| The separation of the alleles of a gene pair takes place during? | Anaphase I of meiosis |
| If hairy toes were a recessive sex-linked trait, who would have more hairy toes? Men or Woman | Men |
| Information in the boxes of punnet squares represent? | Genotypes of offspring |
| How many different types of gametes may be produced by an organism with the genotype RrYy? | Four |
| A codon can be found in | mRNA |
| The 5" cap of a mature mRNA molecule.... | protects newly made mRNA from degradation |
| An operon consist of.... | Structural Gene, Repressor Gene, Operator Region |
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