BIO 210 EXAM 3 STUDY GUIDE WITH
COMPLETE SOLUTIONS
Haploidy - ANSWER-Having one set of chromosomes
Diploidy - ANSWER-Having two sets of chromosomes
Homologous chromosomes - ANSWER-Chromosomes with the same genes in the
same order
How many rounds of homologous chromosomal replication occurs during meiosis? -
ANSWER-One round
When do the chromosomes replicate during meiosis? - ANSWER-Before meiosis I
Are the products (cells) of meiosis 1 haploid or diploid? - ANSWER-Haploid cells
Are the products of meiosis 2 haploid or diploid? - ANSWER-Haploid cells
What's the key event during meiosis 1? - ANSWER-(Crossover) Pairing of Homologous
chromosomes
What's the key event during meiosis 2? - ANSWER-Sister chromatids separate
Synapsis - ANSWER-Pairing of homologous chromosomes (during meiosis 1), makes a
tetrad
Crossover - ANSWER-Exchange of genetic material between homologous
chromosomes
Tetrad - ANSWER-A group of four chromatids formed during meiosis
Why is meiosis called a reduction division? - ANSWER-because it reduces the number
of chromosomes to half the normal number so that, when fusion of sperm and egg
occurs, baby will have the correct number. Results in haploid cells
P0 generation - ANSWER-Parental generation
F1 generation - ANSWER-First filial generation
F2 generation - ANSWER-Second filial generation
Dominant trait - ANSWER-Trait that is expressed
, Recessive trait - ANSWER-Trait masked by dominant allele
Allele - ANSWER-Different forms of a gene
Phenotype - ANSWER-Physical expression of genotype
Models for DNA replication, and which one was experimentally verified as valid? -
ANSWER-Semi-conservative, conservative, dispersive;
semi-conservative verified
Origin of replication on bacterial chromosome - ANSWER-OriC
Enzyme unwinding DNA double helix - ANSWER-Helicase
Y-shaped structure for DNA replication - ANSWER-Replication fork
Enzyme preventing DNA supercoiling - ANSWER-Topoisomerase
Are the primers during DNA replication composed of DNA or RNA - ANSWER-
Composed of RNA
What is the enzyme that provides the primer for DNA replication? - ANSWER-Primase
Genotype - ANSWER-Genetic makeup of an organism
Homozygosity - ANSWER-Having two identical alleles for a gene
Heterozygosity - ANSWER-Having two different alleles for a gene
Phenotypic ratio in mono hybrid cross - ANSWER-3:1
Genotypic ratio in mono hybrid cross - ANSWER-1:2:1
Hemizygosity - ANSWER-Presence of only one allele for a gene
Do X-linked disorders disproportionately affect males or females? Why - ANSWER-
Males, because males only have 1 X chromosome (hemizygosity) and females have 2.
Carrier of X-linked recessive allele - ANSWER-Female with one affected X chromosome
and a dominant without
Phenotypic ratio in dihybrid cross - ANSWER-9:3:3:1
COMPLETE SOLUTIONS
Haploidy - ANSWER-Having one set of chromosomes
Diploidy - ANSWER-Having two sets of chromosomes
Homologous chromosomes - ANSWER-Chromosomes with the same genes in the
same order
How many rounds of homologous chromosomal replication occurs during meiosis? -
ANSWER-One round
When do the chromosomes replicate during meiosis? - ANSWER-Before meiosis I
Are the products (cells) of meiosis 1 haploid or diploid? - ANSWER-Haploid cells
Are the products of meiosis 2 haploid or diploid? - ANSWER-Haploid cells
What's the key event during meiosis 1? - ANSWER-(Crossover) Pairing of Homologous
chromosomes
What's the key event during meiosis 2? - ANSWER-Sister chromatids separate
Synapsis - ANSWER-Pairing of homologous chromosomes (during meiosis 1), makes a
tetrad
Crossover - ANSWER-Exchange of genetic material between homologous
chromosomes
Tetrad - ANSWER-A group of four chromatids formed during meiosis
Why is meiosis called a reduction division? - ANSWER-because it reduces the number
of chromosomes to half the normal number so that, when fusion of sperm and egg
occurs, baby will have the correct number. Results in haploid cells
P0 generation - ANSWER-Parental generation
F1 generation - ANSWER-First filial generation
F2 generation - ANSWER-Second filial generation
Dominant trait - ANSWER-Trait that is expressed
, Recessive trait - ANSWER-Trait masked by dominant allele
Allele - ANSWER-Different forms of a gene
Phenotype - ANSWER-Physical expression of genotype
Models for DNA replication, and which one was experimentally verified as valid? -
ANSWER-Semi-conservative, conservative, dispersive;
semi-conservative verified
Origin of replication on bacterial chromosome - ANSWER-OriC
Enzyme unwinding DNA double helix - ANSWER-Helicase
Y-shaped structure for DNA replication - ANSWER-Replication fork
Enzyme preventing DNA supercoiling - ANSWER-Topoisomerase
Are the primers during DNA replication composed of DNA or RNA - ANSWER-
Composed of RNA
What is the enzyme that provides the primer for DNA replication? - ANSWER-Primase
Genotype - ANSWER-Genetic makeup of an organism
Homozygosity - ANSWER-Having two identical alleles for a gene
Heterozygosity - ANSWER-Having two different alleles for a gene
Phenotypic ratio in mono hybrid cross - ANSWER-3:1
Genotypic ratio in mono hybrid cross - ANSWER-1:2:1
Hemizygosity - ANSWER-Presence of only one allele for a gene
Do X-linked disorders disproportionately affect males or females? Why - ANSWER-
Males, because males only have 1 X chromosome (hemizygosity) and females have 2.
Carrier of X-linked recessive allele - ANSWER-Female with one affected X chromosome
and a dominant without
Phenotypic ratio in dihybrid cross - ANSWER-9:3:3:1
