Duchenne muscular dystrophy is a sex-linked disorder. if a father has a normal x chromosome and the mother is a carrier, what are the odds that a male child would have duchenne muscular dystrophy? what are the odds for a female child to have the disease or be a carrier?

When does a spring tide occur? question 9 options: they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur twice a year in the spring and fall. they occur on the date of the vernal equinox each year, no matter what stage the moon is in. this is why they are called spring tides. they occur when the sun, moon, and earth are at 45-degree angles from each other. this happens once every spring. they occur when the sun, moon, and earth are aligned. in spite of their name, these tides occur all year long.