How do i solve 5.8 and 5.9? 5) Epistatic cross: In this cross there are two genes (dihybrid cross) that are interacting where the presence of one will mask the other, this is known as an epistatic interaction. The genes involved in this cross are notched and apterous (wingless). The notched gene is sex-linked ( c chromosome) while apterous (wingless) is on an autosome. Both genes display dominance so heterozygotes will appear to have the wild phenotype. When apterous (wingless) is expressed (in a double recessive individual), we can not determine whether an individual has notched-wings or wild-type wings (Because it has no wings!). 5.1) Use the following symbols to write out the cross: Male: o, Use XnnY where " n " is either nw or nww: Female: + , Use XnnXn where " n " is either nw, or nwc+ On another chromosome: Apterous: wl Wild-type Apterous: wl + A genotype would include information about the sex and gene associated with the x-chromosome and a secondary gene that determines wings. Example: XYn/wl++wl+ 5.2) What would the cross look like if we mated a notched/wingless male with a wild-type female for the same two traits? Place the sex (symbol) of the individual on the first set of lines and their respective genotypes using the suggested notations from the previous question in the second set (the genotypes should also refect the sex). Sex: Genotypes x 5.3) What are the gametes produced by either sex in the parental generation? Place the symbol for sex on the first set of lines and write down the gametes produced by that sex in the following set of lines, respectively. Sex: Gametes produced: 5.4) Using the gametes that you produced from the previous question, fill in the Punpet square and show the resulting offspring from the cross. Place female gametes to the left of the Punpet square and male gametes above.5.5) What is the phenotypic distribution for notched wing and wild-type wing for males and females? Do you observe any wingless flies? Why not? Remember to also include information about the sex of the individuals with the respective phenotype. 5.6) What would the F1 cross look like if we mated a male F1 and a female F1? Place the sex (use the symbol) of the individual on the first set of lines and their respective genotypes in the second set (the genotypes should also refect the sex). Sex: Genotypes x 5.7) What are the gametes produced by either sex in the F1 generation? Place the genotypes (these genotypes should display the sex and the trait we are studying) on the first set of lines and write down the gametes produced by that sex in the following set of lines, respectively. Sex: Gametes produced: 5.8) Using the gametes that you produced from the previous question, fill in the Punnet square and show the resulting offspring from the cross. Place female gametes to the left of the Punnet square and male gametes above. 5.9) How many different phenotypes would you expect to observe in the F2 generation? List them. What is the proportion of.

1. How do i solve 5.8 and 5.9?
5) Epistatic cross: In this cross there are two genes (dihybrid cross) that are interacting where the
presence of one will mask the other, this is known as an epistatic interaction. The genes involved
in this cross are notched and apterous (wingless). The notched gene is sex-linked ( c
chromosome) while apterous (wingless) is on an autosome. Both genes display dominance so
heterozygotes will appear to have the wild phenotype. When apterous (wingless) is expressed (in
a double recessive individual), we can not determine whether an individual has notched-wings or
wild-type wings (Because it has no wings!). 5.1) Use the following symbols to write out the cross:
Male: o, Use XnnY where " n " is either nw or nww: Female: + , Use XnnXn where " n " is either
nw, or nwc+ On another chromosome: Apterous: wl Wild-type Apterous: wl + A genotype would
include information about the sex and gene associated with the x-chromosome and a secondary
gene that determines wings. Example: XYn/wl++wl+ 5.2) What would the cross look like if we
mated a notched/wingless male with a wild-type female for the same two traits? Place the sex
(symbol) of the individual on the first set of lines and their respective genotypes using the
suggested notations from the previous question in the second set (the genotypes should also
refect the sex). Sex: Genotypes x 5.3) What are the gametes produced by either sex in the
parental generation? Place the symbol for sex on the first set of lines and write down the gametes
produced by that sex in the following set of lines, respectively. Sex: Gametes produced: 5.4) Using
the gametes that you produced from the previous question, fill in the Punpet square and show the
resulting offspring from the cross. Place female gametes to the left of the Punpet square and male
gametes above.5.5) What is the phenotypic distribution for notched wing and wild-type wing for
males and females? Do you observe any wingless flies? Why not? Remember to also include
information about the sex of the individuals with the respective phenotype. 5.6) What would the F1
cross look like if we mated a male F1 and a female F1? Place the sex (use the symbol) of the
individual on the first set of lines and their respective genotypes in the second set (the genotypes
should also refect the sex). Sex: Genotypes x 5.7) What are the gametes produced by either sex
in the F1 generation? Place the genotypes (these genotypes should display the sex and the trait
we are studying) on the first set of lines and write down the gametes produced by that sex in the
following set of lines, respectively. Sex: Gametes produced: 5.8) Using the gametes that you
produced from the previous question, fill in the Punnet square and show the resulting offspring
from the cross. Place female gametes to the left of the Punnet square and male gametes above.
5.9) How many different phenotypes would you expect to observe in the F2 generation? List them.
What is the proportion of phenotypes of the F2 generation? Associate the proportion to the
appropriate phenotype. Hint" do not forget that there are epistatic interactions between these
genes!