California State University, Fullerton » Biology » Biology 251

Question #1

Which of the following scenarios for progeny in a dihybrid cross would suggest linkage of two genes?

A. a 12:3:1 phenotype ratio

B. a 3:1 phenotype ratio

C. a 9:3:3:1 phenotype ratio

D. a phenotype distribution of 40%, 40%, 10% and 10%

Question #2

For individual genes that may be linked, the alleles in a heterozygote obey Mendel's principle of segregation.

A. False

B. True

Question #3

For two genes that may be linked, the loci obey Mendel's principle of independent assortment.

A. False

B. True

Question #4

For a genotype written as Ab/aB:

A. the individual is heterozyogous for both loci, which are not linked.

B. the individual is heterozgous for both loci, with a dominant allele linked to a recessive allele.

C. the individual is heterozgous for both loci, with a dominant alleles linked to each other and the recessive alleles linked to each other.

Question #5

When the recombination frequency is calculated, the percentage corresponds to one map unit or one:

A. Angstrom.

B. Morgan.

C. centiMorgan.

D. nanometer.

E. centiMendel.