Exam 7: Linkage,Crossing Over,And Chromosome Mapping In …

Which of the following performed experiments in maize that gave the evidence that recombination was caused by a physical exchange of genetic information?

Which of the following is a true statement?

The basic principle in duplication mapping is that:

During the crossing over process:

An average of one chiasma during meiosis is equal to how many centiMorgans of genetic distance?

Recombination is commonly the result of a process known as__________ which occurs in Prophase I of Meiosis.

If ascospores are analyzed in the order in which they were created,the fungus must produce spore pairs which are _____________.

In maize,three recessive genes (z,xt,and cm)are linked on chromosome 3.A homozygous plant for the recessives is crossed with a wild-type plant.The F? is crossed to get an F? generation with the following results: What is the map distance between z and cm ?

You sample a number of cells that have undergone meiosis looking for the production of recombinants between the genes ec,vg,and s.You find 10 cells with no crossovers between ec and s,30 with 1 crossover between ec and s,10 with 2 crossovers between ec and s,and zero with three or more crossovers.What is the map distance between the genes ec and s?

A frequency of recombination that is less than 50% implies:

Which of the following is a true statement regarding inversions and recombination in chromosomes?

In maize,three recessive genes (z,xt,and cm)are linked on chromosome 3.A homozygous plant for the recessives is crossed with a wild-type plant.The F? is crossed to get an F? generation with the following results: What is the order of the three genes on chromosome 3?

Which of the following is a true statement regarding the use of recombination frequencies to estimate genetic distance?

Some inversion chromosomes are called ____________ because they allow a mutant chromosome to be kept in the heterozygous condition over the inversion.

In a three point test cross there are two gb bt cq progeny and four + bt + progeny out of a hundred progeny,which are the two rarest groups.What can you conclude?

A mating between a true breeding red,long-stamen plant with a true breeding,white,short-stamen plant yields an F?.This F? is self fertilized to produce an F? that has 300 red long-stamen plants and 100 white short-stamen plants.What can you conclude? 1.The genes are tightly linked 2)The genes are not tightly linked 3)There were no observable crossover events between the genes

Linked genes on a chromosome can be mapped by:

Saccharomyces cerevisiae is a good experimental organism for the study of meiosis because:

In ordered tetrad analysis,what type of pattern occurs when there is a crossover between a locus and the centromere in the first meiotic division?

Which of the following is a false statement regarding chiasmata and the time for crossing over?