Which of the Following Statements Would Explain a Testcross Involving
Which of the following statements would explain a testcross involving F1 dihybrid flies in which more parental-type offspring than recombinant-type offspring are produced?
A) The two genes are closely linked on the same chromosome.
B) The two genes are linked but on different chromosomes.
C) Recombination did not occur in the cell during meiosis.
D) Both of the characters are controlled by more than one gene.
What does a recombination frequency of 50% indicate?
A) The two genes are likely to be located on different chromosomes.
B) All of the offspring have combinations of traits that match one of the two parents.
C) The genes are located on sex chromosomes.
D) Abnormal meiosis has occurred.
Which of the following phrases correctly defines what one map unit is?
A) The physical distance between two linked genes.
B) A 1% frequency of recombination between two genes.
C) 1 nanometer of distance between two genes.
D) The recombination frequency between two genes assorting independently.
Which of the following occurrences describes how recombination between linked genes comes about?
A) Nonrecombinant chromosomes break and then rejoin with one another.
B) Independent assortment sometimes fails.
C) Linked genes travel together at anaphase.
D) Crossovers between these genes result in chromosomal exchange.