Living Systems Homework 3
Part One: IDENTIFICATIONS (IDs). Use the book to help you identify the following. Be as specific as possible, and include names, dates, and relevant facts as appropriate. Be sure to explain the significance of the term.There should be a minimum of three (3) sentences for each ID. Use of the internet is okay if you are stuck, as long as you do not plagiarize.
Chapter 14: Mendel and the Gene Idea: Page 251, 7th edition
A) Law of segregation
B) Homozygous vs Heterozygous
C) Law of Independent Assortment
D) Codominance
E) Multiple Alleles
F) Polygenic Inheritance
G) Pedigree Analysis
H) CVS
Part Two: Fun with Punnett Squares: Monohybrid Crosses. Complete the problems below. You must show your work.
1) SpongeBob SquarePants recently met SpongeSusie Roundpants at a dance. SpongeBob is heterozygous for his square shape, but SpongeSusie is round. Create a Punnett square to show the possibilities that would result if SpongeBob and SpongeSusie had children.
A. List the possible genotypes and phenotypes for their children.
B. What are the chances of a child with a square shape? ____ out of ____ or ____%
C. What are the chances of a child with a round shape? ____ out of ____ or ____%
2) Patrick met Patti at the dance. Both of them are heterozygous for their pink body color, which is dominant over a yellow body color. Create a Punnett square to show the possibilities that would result if Patrick and Patti had children.
A. List the possible genotypes and phenotypes for their children.
B. What are the chances of a child with a pink body? ____ out of ____ or ____%
C. What are the chances of a child with a yellow body? ____ out of ____ or ____%
Part Three: Fun with Sex-Linked Punnett Squares. Solve the problems below. You must show your work.
1. In fruit flies, the gene for white eyes is sex-linked recessive. (R) is red and (r) is white. Cross a white-eyed female with a normal red-eyed male.
a. What percent of the males will have red eyes? White eyes?
b. What percent of the females will have red eyes? White eyes?
c. What total percent of the offspring will be white-eyed?
d. What percent of the offspring will be carriers of the white eye trait?
2. Using the same information as for question #1, cross a heterozygous red-eyed female with a red-eyed male.
a. What are the genotypes of each parent?
b. What percent of the children will have red eyes?
c. What percent of the children will have white eyes?
Part Four: Inquiry into Pea Plants
You are handed a mystery pea plant with long stems and purple flowers and asked to determine its genotype as quickly as you can. You know the allele for long stems (L) is dominant to that of dwarf stems (l) and that the allele for purple flowers (P) is dominant to that of white flowers (p).
a) What are all the possible genotypes for your mystery plant?
b) Describe the one cross you would do, out in you garden, to determine the exact genotype of your mystery plant.
c) Make your predictions using the following format: If the genotype of the mystery plant is ______, the plants resulting from my cross will be ______.