Question

W e pressing a recessive allele? Use the following information to answer Questions 4 and 5. Duchenne muscular dystrophy is an X-linked recessive disease that causes degeneration and weakness in muscles. The normal condition is represented by the superscript D, and the allele that causes Duchenne muscular dystrophy is represented by the superscript d. 4. Draw a Punnett square to show a cross between a homozygous-dominant female and a male with Duchenne muscular dystrophy. 5. Which combination of parental genotypes is most likely to result in carrier daughters?

Answer 1

4 let X be a normal and x be a recessive allele.

This disease is a x linked recessive trait. So the affected females should have both x alleles.

cecessive tray uld contain Recessine alle Duchenne is a X-linked recess so the Gith female affected sch the & Chromatome. 4. Punnet samare Homoly gous female Affected a xxxx male make y[XY XY I 5. Mostly affected males and unaffei females or unaffected males and affected females or unaffected males and carrier females can give rise to carrier daughters. The possible genotypes are as follows 0 (XX x xY) (As ginen above) xx ,XX, XY and xy Caorierdoughters ® (xy xxx) Xx X x , XY, KY carrier daughters Cxy xxx wo ② xx, xx, xx, xy why carrier daughter