Question

need help with 6-7

6. In fairies, individuals can have dull or iridescent wings and shimmery or glittery skin. Individuals who have iridescent wings almost always also have glittery skin while individuals who have dull wings almost always have shimmery skin. Is crossing over and recombination likely to occur between these two genes? Why or why not? 7. The maximum rate for crossing over between two genes is 50%. Why?

Answer 1

Question

6. According to the result given in the question, recombination is not likely to take place. This is because crossing oved and recombination take place during crossing -over at the process of meiosis I and lead to the production of offspring with new traits.But, in this case, iridescent wings have glittery skin always and individual with dull skin have shimmery skin. It means the genes for these two chracters are inherited togeather and this phenomeon is known as "linkage". The phenomeon of linkage is where two or more genes are always togeather is same combination. Therefore, the linkage is likely to place here.

7. The maximum rate for crossing over between genes is 50 percent because random assortment of gene process during gamete formation produce non-linked genes produce 1:1 parental to non-parental strand. Therefore, according to the recombination formulae,

Recombination frequency = number of recombinants/total number of progeny

= 1/1+1= 50 percent