1) In screech owls, three crossesbetween different pairs of red and silver indiv

Question

1)      In screech owls, three crossesbetween different pairs of red and silver individuals yielded thefollowing results:

Cross

Parental phenotypes

Offspring phenotypes and proportions

A

Red ´ silver

All red

B

Red ´ silver

½ red, ½ silver

C

Red ´ silver

½ red, ¼ silver, ¼ white

Three crosses between different pairs of red owls yieldedthe following results:

Cross

Parental phenotypes

Offspring phenotypes and proportions

D

Red ´ red

All red

E

Red ´ red

¾ red, ¼ silver

F

Red ´ red

¾ red, ¼ white

Explain the mode of inheritance of this trait. Using appropriatesymbols, write the genotypes of each parent and each phenotypicclass of offspring in the tables above.

Cross

Parental phenotypes

Offspring phenotypes and proportions

A

Red ´ silver

All red

B

Red ´ silver

½ red, ½ silver

C

Red ´ silver

½ red, ¼ silver, ¼ white

Explanation / Answer

Three crosses between different pairs of red owls yielded thefollowing results:

Red ´ silver

                    RRRR            X    RSRS

All red -----------RRRS

                            Red ´ silver

                    RR RS   X            RSRS

            

RS

RS

RR

RRRS             Red

RRRS             Red

RS

RS RS             silver

RS RS            silver

                 ½ red, ½ silver

                             

                            Red ´ silver

                    RR RS     X            RSRS

            

RS

RS

RR

RRRS             Red

RRRS             Red

RS

RS RS             white

RS RS            silver

DUE TO INCOMPLETE DOMINANCE

                           ½ red, ¼ silver, ¼ white

RS

RS

RR

RRRS             Red

RRRS             Red

RS

RS RS             silver

RS RS            silver

Related Questions

Navigate

• Browse (All)
• Browse 1
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.