Seeds from a diploid true breeding plant that produces purple flowers were mutagenized. Below are the genotypes and phenotypes of plants generated from this mutagenesis experiment. Assume that the wild-type alleles (uppercase) are dominant to mutant alleles (lower case) and the two genes are not linked. Genotype Flower color A_B_ Purple aaB_ Orange

The Answer is B

Explanation

abb genotype produces brown pigment. In this case mutant alleles are present at both the locus and brown pigment is produced which suggest the brown pigment is the precursor for the pathway and is present even when both mutant alleles are present.

aaB_ genotype produces orange pigment which suggest that B allele is responsible for conversion of brown pigment to orange pigment. This is also supported by the genotype A_bb which produces brown pigment because wildtype B allele is not present. A allele cannot convert Brown to orange, therefore flower colour is brown.

A_B_genotype produces purple pigment which suggest both A and B allele are responsible for conversion of brown pigment to purple pigment

d. in sexual reproduction, offspring have more chromosomes than

either parent.

asexual reproduction results in offspring which are genetically the same as the parent organism (not counting a rare mutation). sexual reproduction produces a random mixture of the genetics derived from both parents

explanation:

1. loamy sand is about 80% sand with 10% clay and defined mostly by sand particles with some clay to provide structure and fertility. the sand particles are easily visible and the soil holds structure but breaks apart easily.

2. scott sand can improve his soil quality by incorporating more silt and organic matter into the soil. peat moss and organic matter can also be incorporated.