8. Five points. Jimsomweed plants can produce purple or white flowers and spiny

Question

8. Five points. Jimsomweed plants can produce purple or white flowers and spiny or smooth seed pods. A purple spiny plant is crossed with a white spiny plant. This cross produces 89 purple spiny; 92 white spiny; 31 purple smooth and 27 white smooth plants. What are the genotypes and phenotypes of the parental plants and the progeny plants? a. Parental-phenotype: genotype: Parental -phenotype: genotype: b. Offspring plants- genotypes and phenotypes c. Calculate the recombination frequency using these results

Explanation / Answer

purple spiny: 89

white spiny: 92

Purple smooth: 31

White smooth: 27

though we are getting a ratio 3:3:1:1 approx

a. genotype of the parent

parental genotype: PpSs X   ppSs

the phenotype of parent Purple spiny X white Spiny

b.

c.

recombination frequency

= (number of recombinants/ total number of progeny)*100

= (31+27/239)*100

=58/239*100

= 24.24%

pS ps PS purple spiny (PpSS) purple spiny - PpSs Ps purple spiny- PpSs purple smooth - Ppss pS White spiny - ppSS White spiny - ppSs ps white spiny - ppSs white smooth - ppss

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