Genetics and Dihybrid Crosses Quiz

What is a dihybrid cross used to determine?

• The genotypic ratio of a monohybrid cross

• The phenotypic ratio of a monohybrid cross

• The allele combinations of offspring for linked genes

• The allele combinations of offspring for two unlinked genes

What is the FOIL method used for in genetics?

• To determine the sequence of DNA

• To define linkage groups

• To calculate gamete combinations in a dihybrid cross

• To identify sex chromosomes

What distinguishes autosomes from sex chromosomes?

• Autosomes are involved in sex determination

• Sex chromosomes are identical in appearance

• Autosomes are not involved in sex determination

• Sex chromosomes have the same gene loci

What occurs during crossing over in prophase I?

• Genes are deleted

• Non-sister chromatids of a homologous pair exchange alleles

• Sister chromatids exchange alleles

• Chromosomes duplicate

What is a linkage group?

• A group of genes that are always inherited separately

• A group of genes whose loci are on the same chromosome

• A group of genes that follow the law of independent assortment

• A group of genes on different chromosomes

What is the expected phenotypic ratio for a dihybrid cross involving linked genes?

• 1:1:0.1:0.1

• 1:1:1:1

• 9:3:3:1

• 3:1

In a test cross of linked genes, what are recombinants?

• The most common phenotypes

• Combinations of genes not found in parents

• The least common genotypes

• Combinations of genes found in parents

What is the phenotypic ratio for a heterozygous test cross of unlinked genes?

• 3:1

• 1:1:1:1

• 9:3:3:1

• 1:1:0.1:0.1