5 Written questions
5 Matching questions
- What happens during each phase of Meiosis I?
- Example of a polygenic trait in humans.
- What is the reason for codominance?
- Why did Mendel use pea plants for his model organism?
- Explain how to determine the gametes for a dihybrid cross when the parent gamete is TtYy
- a They are small and are easy to grow
- b Skin color
- c The phenotypes for both alleles are equally expressed in the offspring.
- d During prophase, each copied chromosome matches up with its homologous chromosome. Crossing-over increases the allele combinations on chromatids. In metaphase, spindle fibers form. In anaphase, chromatids seperate. In telophase, a nuclear membrane forms around the chromosomes. During cytokinnesis, the cells spilt, and two cells are made.
- e TtYy; First: TY; Outside: Ty; Inside: tY; Last: Ty. The F.O.I.L. method determines all the possible allele combinations
5 Multiple choice questions
- meiosis II results in 4 haploid daughter cells
- Environmental conditions can change the gene expression and influence genetically controlled traits.
- The trait is visible whenever a dominant allele is present in the genotype such as TT or Tt(both tall)
- one of a number of different forms of a gene
5 True/False questions
Describe a situation in flowers that show incomplete dominance → one allele is not completely dominant over the other allele
Explain what causes the different colors in the wings of western white butterflies. → Western white butterflies that hatch in the spring have darker wing patterns than those who hatch in the summer.
Multiple alleles → a gene that has more than two alleles
Metaphase II → The fibers pull the homologous chromosomes toward opposite ends of the cell
What are some exceptions to Mendel's principles? → Traits can be controlled by incomplete alleles and codominant alleles, or by genes with more than two possible alleles. Traits can also be controlled by several genes.