One more genetics question!?

Question

In white pine trees, the gene for needle shape has two alleles. A dominant allele produces straight needles and a recessive allele produces bent needles. The gene for cone length, which is located on a different chromosome than the needle shape gene, also has two alleles. The dominant allele produces long cones and the recessive allele produces short cones. The following cross is carried through to the F2 generation: a pine tree that is homozygous for straight needles and short cones crossed with a pine tree that is homozygous for bent needles and long cones. The phenotypic ratio in the F2 generation is:

Answer 1

9:3:3:1--statistically, there will be 9 with the dominant/dominant phenotype (straight needles and long cones), 3 with the dominant/recessive phenotype (straight needles and short cones), 3 with the recessive/dominant phenotype (bent needles and long cones), and 1 with the recessive/recessie phenotype (bent needles and short cones).

Answer 2

Parent plants are:

NNcc X nnCC

F1 will all be NnCc

F2 will have the following ratio:

9/16: Straight needles, long cones
3/16: Straight needles, short cones
3/16: bent needles, long cones
1/16: bent needles, short cones

Answer 3

This is a dihybrid cross

See the wiki page - the punnet square is a little complex to reproduce here.

The phenotypic ratio in the F2 generation is 9:3:3:1

Answer 4

http://en.wikipedia.org/wiki/Allele