2. Dragon color and wing size are controlled by two separate gene loci with 2 al

Question

2. Dragon color and wing size are controlled by two separate gene loci with 2 alleles each. A dragon that is red with large wings (RrWw) mates with another that is silver with small wings (Dww). a. Write out the genotypes of the 4 gametes (of each parent) that will be used to determine the resultant offspring from the cross. b. Do a Punnett Square to demonstrate all the possible resultant offsprings' allele combinations (genotypes) from parents having genotypes RrWw and ITww. c. What is the resultant genotypic ratio? phenotypic ratio i. Be sure you indicate what each part of the ratio refers to i.e. don't just say 4:3:2. Say what the numbers refer to)

Explanation / Answer

RrWw (red, large wings) x rrww (silver, small wings)

a. RW, Rw, rW, rw
b. Punnett Square below.

RW

Rw

rW

rw

RW

RRWW

RRWw

RrWW

RrWw

Rw

RRWw

RRww

RrWw

Rrww

rW

RrWW

RrWw

rrWW

rrWw

rw

RrWw

Rrww

rrWw

rrww

c.

Genotypic ratio:                                

1/16 RRWW                                       

2/16 RRWw

2/16 RrWW

4/16 RrWw

1/16 RRww                                         

2/16 Rrww

1/16 rrWW                                        

2/16 rrWw

1/16 rrww         

                                 

Phenotypic ratio:

1/16 +2/16+2/16+4/16= 9/16 red, large wings

1/16+2/16= 3/16 red, small wings

1/16+2/16 = 3/16 silver, large wings

1/16 silver, small wings

9:3:3:1 ratio

RW

Rw

rW

rw

RW

RRWW

RRWw

RrWW

RrWw

Rw

RRWw

RRww

RrWw

Rrww

rW

RrWW

RrWw

rrWW

rrWw

rw

RrWw

Rrww

rrWw

rrww

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