Duchenne muscular dystrophy (md) is caused by a recessive allele located on the x chromosome (xd). affected people experience progressive weakening and loss of skeletal muscle. which of the sets of genotypes below would explain how two unaffected people (neither mom or dad have md) could have a child with duchenne md? a. option 1 b. mom is xdxd and dad is xdy c. mom is xdxd and dad is xdy d. mom is xdxd and dad is xdy

i'm gonna put a couple so you can chose from

explanation:

if you know the fur color of the offspring mice, you can use the ratios to identify the genotypes of the parents.

if either parent mouse passes a dominant allele, the offspring will have black fur.

if the parental mice has two different fur color (i.e white and black) , the color of the offspring's fur would be either black, white, or the combination of both (grey)

hope this : )

you must remain stopped until the stop signal is retracted and the red lights are turned off. approaching traffic in the opposite roadway of a divided highway shall not be required to stop, even if the school bus has the stop-arm extended and the alternately flashing warning signal lamps on.

i don't know. if i were you, i would search it up online : d