22 Questions
What is the correct ratio of phenotypes in the F2 generation of an F1 × F1 cross-fertilization?
9:3:3:1
What is the mechanism responsible for recombination in meiosis?
Crossing over
What is the genotype notation for a plant with both dominant alleles for seed color and seed shape?
YYRR
What is the term for the process by which alleles of genes on nonhomologous chromosomes segregate independently during gamete formation?
Law of Independent Assortment
What was the organism used by Thomas Hunt Morgan to provide evidence for the chromosome theory of inheritance?
Fruit flies
What is the result of crossing over during meiosis?
Recombination of alleles on the same chromosome
What is the recombinant frequency between the genes for black and purple flowers if 751 offspring have the wild type and 49 have the gray purple flowers?
49 / (751 + 49) x 100%
What is the correct notation for the genotype of an individual with two genes, one with allele w and one with allele m?
w m+ / w+ m
What is the relationship between the distance between genes and the recombination frequency?
The further apart the genes, the higher the recombination frequency.
What is the result of crossing over between two genes?
Production of recombinant gametes
What is the unit of measurement for map distance?
CentiMorgans (cM)
What is the range of recombination frequency values?
0.00-0.50
What is the recombinant frequency in a cross between a wild type fruit fly and a double mutant fruit fly if there are 1472 parental types and 94 recombinants in a total of 1566 offspring?
6.4%
Why do genes that are located on the same chromosome tend to be inherited together?
Because they are located near each other on the same chromosome
What is the term for the process by which homologous chromosomes exchange genetic material, resulting in recombinant offspring?
Crossing over
What is the notation for the genotype of a wild type fruit fly with gray body color and normal wings?
b+ b+ vg+ vg+
What is the term for a gene that is located on the X chromosome?
X-linked gene
In a dihybrid cross, what is the expected ratio of offspring if the genes are located on different chromosomes?
1:1:1:1
What is the unit of measurement for the distance between two genes on a chromosome?
Map unit
What is the term for the genes that are located on the same chromosome and tend to be inherited together?
Linked genes
What is the result of crossing over between two homologous chromosomes?
Recombinant chromosomes
What is the purpose of a testcross in genetics?
To determine the linkage of two genes
Understand the principles of Mendelian inheritance, meiosis and the chromosome theory. Learn how genes are located on chromosomes and how they segregate and assort independently. Test your knowledge on inheritance patterns and genetic variation.
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