You are a developmental geneticist and perform a mutagenesis screen in Arabidopsis looking for floral organ mutants. You identify a mutant phenotype that has the following organ arrangement, beginning in whorl 1: Sepal-Sepal-Carpel-Carpel Which class of floral identity genes has been mutated? O A-B double mutant O A O SEPALLATA B

Bolting is when a plant starts to spend its energy on producing flowers. Initial bolting time is figured by the number of days from germination to bolting. Rosette area is figured by the average rosette area of the plant at the time of bolting. Researchers created strains of A. thaliana to have varying somatic ploidy levels to study the resulting phenotypes. The graphs show how initial bolting time and rosette area relate to the number of chromosomes in each strain’s somatic cells. Which of the following best describes how a change in genotype affects the phenotype of A. thaliana? The largest average change in both phenotypes occurred from the 2n to the 4n strain. The largest average change in both phenotypes occurred from the 4n to the 6n strain. A lesser number of chromosomes results in plants with a later initial bolting time. A greater number of chromosomes results in plants that have larger rosettes areas.

A. What is double fertilization? B. What are the products of double fertilization? C. Explain the following quote “As an individual, the endosperm is unique as it has three ancestors and never leaves any descendants.” What are the three ancestors referred to in this quote? And why endosperm does not leave any descendants?

What are phase changes in plant development? What two groups of genes control the formation of the flower? What is the ABC hypothesis?

These cells are part of the root tip (a non-reproductive part of the plant).  Knowing what you do about the phases (you can't see this detail from the picture), which cells are diploid?  Select all that apply. Group of answer choices C D A B

What are homeotic genes?  Please exaplain ow they control the sequence of whorl development in flowers according to the ABCDE model.

What is the description of the flower of bread palm? Based on the text.