IB 150 - Unit 2 (Pre-Lecture Notes) Questions With
Complete Solutions
2 Homologous Copies Correct Answers Inherited one set from
mother and one set from father, 2 sets per chromosome type
Causes of Phenotypic variation Correct Answers Environmental
Genetic
Central Dogma of Biology Correct Answers DNA - RNA -
protein
DNA - RNA = Transcription
RNA - protein = Translation
Centromere Correct Answers Point where they are still attached
Chromatid Correct Answers Each replicated copy of
chromosome while still attached
Co-Dominance Correct Answers Both phenotypic traits are
expressed
Complementary Base Pairing Correct Answers T - A
C-G
G-C
A-U
, Complete Dominance Correct Answers Only phenotype of
dominant allele is expressed
Crossing-over Correct Answers Proteins in synaptonemal
complex facilitate rejoining of DNA strands between adjacent
chromatids, including among non-sister chromatids across two
lined up homologs, allowing the exchange of portions of non-
sister chromatids among the homologs
Diploid Correct Answers 2 homologous copies of each
chromosome type (2n)
DNA Polymerase Correct Answers Enzyme that links new
nucleotides during replication
Wrong base every 100,000 tries
Catches mismatches during replication
DNA Proofreading by DNA polymerase Correct Answers Can
stop replication if a strand is wrong and then correct it
DNA structure Correct Answers Double stranded polymer of
paired nucleotides (Double Helix)
Eukaryotes Correct Answers Within nucleus, DNA is held on
separate molecules, 46 chromosomes per cell: distinct copy of
DNA and genes (23 types)
Fertilization Correct Answers Recombine entire genome by
fusion of sex cells
Complete Solutions
2 Homologous Copies Correct Answers Inherited one set from
mother and one set from father, 2 sets per chromosome type
Causes of Phenotypic variation Correct Answers Environmental
Genetic
Central Dogma of Biology Correct Answers DNA - RNA -
protein
DNA - RNA = Transcription
RNA - protein = Translation
Centromere Correct Answers Point where they are still attached
Chromatid Correct Answers Each replicated copy of
chromosome while still attached
Co-Dominance Correct Answers Both phenotypic traits are
expressed
Complementary Base Pairing Correct Answers T - A
C-G
G-C
A-U
, Complete Dominance Correct Answers Only phenotype of
dominant allele is expressed
Crossing-over Correct Answers Proteins in synaptonemal
complex facilitate rejoining of DNA strands between adjacent
chromatids, including among non-sister chromatids across two
lined up homologs, allowing the exchange of portions of non-
sister chromatids among the homologs
Diploid Correct Answers 2 homologous copies of each
chromosome type (2n)
DNA Polymerase Correct Answers Enzyme that links new
nucleotides during replication
Wrong base every 100,000 tries
Catches mismatches during replication
DNA Proofreading by DNA polymerase Correct Answers Can
stop replication if a strand is wrong and then correct it
DNA structure Correct Answers Double stranded polymer of
paired nucleotides (Double Helix)
Eukaryotes Correct Answers Within nucleus, DNA is held on
separate molecules, 46 chromosomes per cell: distinct copy of
DNA and genes (23 types)
Fertilization Correct Answers Recombine entire genome by
fusion of sex cells
