Why didn't the two sons of queen victoria (alfred and arthur) display hemophilia? (refer to pedigree chart)
because they are only carrying one recessive gene (b)
because their father did not have the trait
because they received the dominant gene "y" from their father
because they did not receive the recessive gene (xb) from their mother.

why didn't charles and alexander, the grandsons of queen victoria receive hemophilia from their father leopold?
because the disease is not carried on the "y" chromosome
because helena does not carry the trait
because helena carries the trait but it is not homozygous
because the disease is not on the "y" chromosome and helena did not have the trait

Read the rough draft of a student's conclusion to anargumentative editorial.(1) year-round schooling would student achievement.(2) not so much information would have to be crammed intonine months. (3) furthermore, the elimination of long breaks,particularly summer break, would significantly reduce"learning loss" and the additional time wasted at thebeginning of each academic year to reteach previouslylearned material. (4) it is clear that year-round schooling students learn and retain more. (5) the united staleis not the only country to experiment with a year-roundschool schedule. (6) although many still claim that evidenceabout year-round school and its link to higher achievement isinconclusive, these people need to open their eyes and seethat students in these schools consistently score higher oncertain assessments than students who attend schools withtraditional nine-month calendars. (7) it is about time that wereplaced our outdated and inefficient school calendars.which best revises sentence 6 to create a more appropriate and respectful tone