2. INSTRUCTIONS: Below is a portion of a genetics lesson. In the box indicated, please create a Punnett square diagram and pea plant illustrations to solve the practice problem. CONCEPT: PUNNTT SQUARES How to Use Punnett Squares Step 1 Align alleles of parent gametes on top & left-side of square (represents meiosis). Step 2 Fill in the Punnett square (represents fertilization). Step 3 Analyze the possible genotypes & phenotypes of offspring. EXAMPLE: Complete the Punnett Square below. Parent #1 (YY) Y Y y Yy Yy Parent #2 (yy) < 2 Analyze Results 4 Yellow phenotypes 0 green phenotypes y Yy Yy •Each square represents an equally probable genotype & phenotype that one single offspring can inherit. Each fertilization event producing an offspring is independent (1 fertilization event does NOT impact another). CONCEPT: PUNNETT SQUARES PRACTICE: A female dog with black fur (Ff) mates with a male dog that also has black fur (Ff). Determine the possible genotypes and phenotypes of their puppies using a Punnett Square. Black fur (F) is dominant to grey fur (f). a) # of possible Genotypes: FF: Ff: ff: b) % of possible Phenotypes: Black fur: Grey fur: [Your Custom Image Goes Here]
Added by Daniel W.
Close
Step 1
To fill in the Punnett square, we need to list the alleles of the parent gametes on the top and left side of the square. In this case, the female dog has the genotype Ff, so we can list F on the top of the square and f on the left side. The male dog also has the Show more…
Show all steps
Your feedback will help us improve your experience
Anitha Mary and 98 other Biology educators are ready to help you.
Ask a new question
Labs
Want to see this concept in action?
Explore this concept interactively to see how it behaves as you change inputs.
Key Concepts
Recommended Videos
For questions 1-5 match the correct inheritance pattern with its definition: A. Sex-Linked - Traits on the X chromosome that are often more common in males B. Multiple Alleles - More than two alleles for a trait C. Incomplete Dominance - When two dominant alleles blend forming an intermediate phenotype D. Codominance - When two dominant alleles are expressed equally or fully E. Polygenic Inheritance - More than one gene determines a trait Part 2: Open Response You will be graded on both filling in the Punnett square and answering the question in the blank below. There are four Punnett square problems featured below: Problem One: Incomplete Dominance Mrs. Jay has decided she wants to go into the dog breeding business and wants to use her dog Millie. Millie is heterozygous light brown (BB'), a combination of dark brown (B) and white (B'). Mrs. Jay wants to get puppies that are dark brown, light brown, and white. She has two options for males to mate with Millie: Denver, who is also light brown, or Charley, who is white. Create Punnett Squares for each dog to help Mrs. Jay figure out the answer: Charley: Denver: To get three different colors of puppies, who should mate with Millie?
Anitha M.
Punnett square #1: When Mendel crossed a white-flowered pea plant with a purple-flowered pea plant (the P generation), he got all purple-flowered plants (the F1 generation). Draw the Punnett square for his NEXT experiment when he crossed two hybrid purple-flowered plants from the F1 generation to produce an F2 generation (the "grand baby" pea plants from the first ones he experimented with). Describe the genotypes and phenotypes of the F2 generation. Punnett square #2: Draw the Punnett square for a family that has a color-blind daughter and a color-sighted son. Hint: start with the genotype for the color-blind daughter. Could there have been any other genetic possibilities for the F1 generation? If so, what are they?
Supreeta N.
2. In a cross of true-breeding black and true-breeding white dogs, all of the offspring are black. In the subsequent F1 cross, calculate the probabilities of the combinations of offspring below. a) Which allele, black or white, is dominant? b) Probability calculation 1: a litter of six pups, four with black fur and two with white fur. c) Probability calculation 2: a first litter of six pups, three with black fur and three with white fur; followed by a second litter of seven pups, five with black fur and two with white fur. 3. Consider a trihybrid cross: AaBbCc x AaBbCc. a) Predict the expected genotype ratio using a branch diagram. b) Predict the expected phenotype ratio using a branch diagram.
Briana D.
Recommended Textbooks
Biology for AP Courses
Objective Biology for NEET
Introduction to General, Organic and Biochemistry
Transcript
18,000,000+
Students on Numerade
Trusted by students at 8,000+ universities
Watch the video solution with this free unlock.
EMAIL
PASSWORD