Bio 210 Exam 3 Study Guide Questions and
Answers|Latest Update
Why is meiosis called a reduction division? 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 Parental generation
F1 generation First filial generation
F2 generation Second filial generation
Dominant trait Trait that is expressed
Recessive trait Trait masked by dominant allele
Allele Different forms of a gene
, Phenotype Physical expression of genotype
Genotype Genetic makeup of an organism
Homozygosity Having two identical alleles for a gene
Heterozygosity Having two different alleles for a gene
Phenotypic ratio in mono hybrid cross 3:1
Genotypic ratio in mono hybrid cross 1:2:1
Hemizygosity Presence of only one allele for a gene
Do X-linked disorders disproportionately affect males or females? Why Males, because
males only have 1 X chromosome (hemizygosity) and females have 2.
Answers|Latest Update
Why is meiosis called a reduction division? 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 Parental generation
F1 generation First filial generation
F2 generation Second filial generation
Dominant trait Trait that is expressed
Recessive trait Trait masked by dominant allele
Allele Different forms of a gene
, Phenotype Physical expression of genotype
Genotype Genetic makeup of an organism
Homozygosity Having two identical alleles for a gene
Heterozygosity Having two different alleles for a gene
Phenotypic ratio in mono hybrid cross 3:1
Genotypic ratio in mono hybrid cross 1:2:1
Hemizygosity Presence of only one allele for a gene
Do X-linked disorders disproportionately affect males or females? Why Males, because
males only have 1 X chromosome (hemizygosity) and females have 2.
