In nasturtiums, double flowers(D) are dominant over singled flowers(d). Two double-flowered plants when crossed produce 17 double-flowered plants and 6 single flowered ones.
what are the genotypes of the parents?
2007-03-28 21:23:02 · 5 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Well the problem tells you that 2 double flowered plants are crossed. Ask yourself what kind of genotype (don't be concerned with crossing yet) is needed to have a double flowered plant. You only have two options DD or Dd (dd you have a singled flowered plant). Now try doing some Punnett squares using either DDxDD or DDxDd or DdxDd and see which one gives you a ratio similar to 17:6
2007-03-28 21:32:30 · answer #1 · answered by b w 2 · 1⤊ 0⤋
Well they would both have to be Dd as if either one was DD then there would be no single flowered plants and since there is a mix then they cant both be dd either.
2007-03-29 04:34:13 · answer #2 · answered by sociald 7 · 0⤊ 0⤋
both have to be heterozygous dominant,i.e.
D d
D DD Dd
d Dd dd
Dominant: recessive (phenotypically)
3:1
the ratio 17:6 can be roughly equated to 3:1
as in the above case
2007-03-29 05:53:39 · answer #3 · answered by rara avis 4 · 0⤊ 0⤋
Both parents are heterozygote in this locus (Dd).
2007-03-29 06:06:17 · answer #4 · answered by zhabiz v 1 · 0⤊ 0⤋
Dd and Dd.
2007-03-29 05:17:32 · answer #5 · answered by sindy 2 · 0⤊ 0⤋