17. You are studying two loci - one that controls pea color and one that control

Question

17. You are studying two loci - one that controls pea color and one that controls pea size.r+ homozygotes are purple, r homozygous are red, and r+ is dominant to r. s+ homozygotes are large, s homozygotes are small, and s+ is dominant to s. You mate plants that are heterozygous at the r locus and homozygous recessive at the s locus to plants that are heterozygous at ther locus and heterozygous at the s locus. What proportion of the progeny will be red and small? b. 1/8 c. 1/4 d. 3/4 e. None of the above

Explanation / Answer

Pea plants with genotype (r+r, ss) is mated with (r+r, s+s)

From the Punnett square above, the proportion of offsprings that are red and small is,

= 2/16

= 1/8

(Option b)

r+s r+s rs rs r+s+ r+r+ s+s r+r+ s+s r+r s+s r+r s+s r+s r+r+ ss r+r+ ss r+r ss r+r ss rs+ r+r s+s r+r s+s rr s+s rr s+s rs r+r ss r+r ss rr ss rr ss

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