the process of crossing over

Question 1

A homologous pair of chromosomes before crossing over

Answer 1

1) it takes place in prophase I of meiosis
2) homologous chromosomes comes to lie close together
3) homologous chromosomes ( consisting of 4 chromatids in total ) involved in crossing over is referred to as a bivalent

Question 2

chromatids intertwining

Answer 2

1) one chromatid of each chromosomes overlap with a chromatid of its homologous ( or homologous partner )
2) the points of crossing over are called chiasmata ( singular chiasma )

Question 3

a pair of homologous chromosomes after crossing over

Answer 3

1) the chromosomes separate in such a way that each has one original chromatid and one chromatid with some genetic material from its homologous partner

Question 4

what does cross over result in

Answer 4

it results in an exchange of genetic material so that each chromosome has genetic material from both parents

Question 5

what does the exchange of genetic material result in

Answer 5

the cells ( usually gametes ) produced will therefore be different from each other therefore resulting in variation in the offspring