An exchange of segments between non-homologous chromosomes is called as:
1. Crossing over

2. Inversion

3. Reciprocal translocation

4. Transposing

Which of the following will demonstrate crossing over?
1. A fly that received only y+w+m+ and ywm chromosomes from her parents was able to transmit different combinations of alleles to her offspring.
2. A fly with a gray body and red eyes (wild type) was able to produce offspring with gray bodies and white eyes.
3. True breeding yellow, white, miniature flies always had yellow, white, miniature offspring.
4. None of these examples demonstrate crossing over.

Which of the following statements is not true of two genes that show 50% recombination frequency?
1. The genes are tightly linked
2. The genes show independent assortment
3. If the genes are present on the same chromosome, they undergo more than one crossovers in every meiosis
4.The genes may be on different chromosomes

A dihybrid test cross results in a 1.2% frequency of recombination. This implies that:
1. genes are located on sex chromosomes.
2. genes are located on heterologous chromosomes.
3. genes exhibit epistatic two factor interaction.
4. genes are located very close to one another on the same chromosome.