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Human traits
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- Lab Exercises: In these exercises, you will learn to use the Punnett square to determine geno- typic and phenotypic outcomes for monohybrid, dihybrid, incomplete, codominant, epistatic, and sex-linked traits. Exercise #1: Monohybrid Crosses A male with blue eyes has a child with a homozygous dominant brown-eyed female. What are the genotypes and phenotypes of the resulting offspring? 1. Genotype rahio R RR Rr Phenoty pe vatio Rr Y FEx PT A male offspring from above has four children with his heterozygous brown-eyed wife. What are the genotypes and phenotypes of the resulting offspring? What are the genotypic Rt 2. and phenotypic ratios? Y RR IRr K r Rr Yr 3. A heterozygous brown-eyed male has four children with his blue-eyed wife. What are the genotypes and phenotypes of the resulting offspring? What are the genotypic and pheno- typic ratios? 120EXERCISE 5 MENDELIAN TRAITS IN HUMANS 1 While most human traits are polygenic, the traits in the chart below have traditionally been considered Mendelian traits. More recent research has disputed the single-gene nature of some of these traits, but for the purpose of this exercise, assume that the following traits are Mendelian. Work with a partner to help each other determine your own phenotypes and possible genotypes for these traits. Write your answers in the chart. (Note: Refer to the table on p. 62 for information about these traits.) Mendelian Trait Cleft Chin (Dominant) Freckles (Dominant) Attached Earlobes (Recessive) Hitchhiker's Thumb (Recessive) Widow's Peak (Dominant) Your Your Possible Phenotype Genotype(s)PRACTICE EXERCISES 2: 1. For instance, in cows, red (R) and white (W) are two possible hair colors. However, when a red cow and a white cow mate, instead of one color being dominant over the other, BOTH are expressed, in a color called roan (red-and-white). Fill out the genotypes below: Homozygous red: Homozygous white: Roan: Show the Punnett Square for a cross between two roan cows: Probability of roan offspring: Probability of red offspring: Probability of white offspring: % 2 If R is the allele for red and W is the allele for white in a flower, and this is codominance, show what happens if a red flower is crossed with a white flower. Red genotype: White genotype: Phenotype (offspring): Genotype (offspring):
- Learning Task 6: Create a family tree showing the F1 and F2 generations of vour mother and father side. Describe the dominant traits that appear in both families. Illustrate your answer in your notebook. PIVOT 4A CALABARZON 23LEARNING TASK 1 "BIKINI BOTTOM GENETICS" Use the information for SpongeBob's traits to write the phenotype (physical appearance) for each item. Trait Dominant Gene Recessive Gene PHENOTYPE Body Shape SquarePants (S) Round pants (s) Body Color Yellow (Y) Blue (y) Eye shape Round (R) Oval (r) Nose Style Long (L) Stubby (1) LEARNING TASK 2 Use the information in Learning Task 1 to write the genotype (or genotypes) for each trait below. (a) Yellow body (b) Roundpants (e) Stubby nose - (f) Round eyes - (g) Squarepants - (h) Blue body - (c) Oval eyes - (d) Long nose - Determine the genotypes for each using the information in Learning Task 1. (a) Heterozygous Round Eyes (b) Homozygous Long Nose (c) Purebred Squarepants (d) Hybrid Yellow bodyActivity 4 Identification of phenotype of known genotype The characteristic of the color of the red tomato fruit (R) is dominant over the characteristic of the yellow color (r) The characteristic of the color of white flowers (W) is dominant over the characteristic of the color of the yellow flowers (w), and the characteristic length of the stem of the plant (T) is dominant over the short characteristic (t) If a red fruit plant with yellow and long-stemmed flowers is crossed, with anotheryellow, white-flowered and short-stemmed plant, knowing that the dominant characteristic is pure. What is the phenotype of individuals of the resulting generation?
- Learning Task # 2. Punnett Square a. Given the cross AaBb X AaBb, construct a Punnett square and determine the genotypic ratio (the probability that a particular genotype will occur) of the resulting cross b. Given this cross, TtGg X TtGg, fill-up the squares with the correct answer.ACTIVITY 1: Monohybrid cross in corn In corn the allele for purple seed (P) is dominant and the allele for yellow seed (p) is recessive. What is the genotype for true-breeding purple corn? true-breeding yellow corn? If true-breeding (homozygous) purple corm is crossed with true- breeding yellow corn, Use the Punnett square below to predict the results of the F1 offspring (male gametes on top, female on left): What is the phenotype of the F,? What is the genotype of the F,? Use the Punnett square below to predict the results of the F, (male gametes on top, female on left) Probability Genotype PhenotypePerformance Task: Regular Biology Name: Who Gets the Money? Worksheet O bindgdoaolon0ne Part Two: Co-dominance and Incomplete dominance Now that have been eliminated, lawyers order blood tests to try to prove their claims. The lawyers have also done some research and read that hair texture is inherited. Type A and type B blood are co-dominant over type O. Rh+ blood is dominant over Rh- blood. Hair texture exhibits incomplete dominance. Homozygous dominants (HH) have curly hair. Homozygous recessives (hh) hawe straight hair. Heterozygotes (Hh) have wavy hair. Homozygous type A blood, heterozygous Rh+, straight hair. Heterozygous type B blood, homozygous Rh+, wavy hai Heterozygous type A blood, heterozygous Rh+, wavy hair. Heterozygous type A blood, homozygous Rh+, wavy hair. Type O blood, Rh-, straight hair. Mr. Jones Mrs. Jones Carl Dale Earl In the space below, draw three Punnett Squares showing the possible offspring of Mr. and Mrs. Jones: for blood type, Rh type, and hair textures.…
- EXERCISE 1 CREATING PUNNETT SQUARES Work in a small group or alone to complete this exercise. Trait F is the Mendelian trait for freckles. The allele for freckles (F) is dominant over the allele for no freckles (). Timmy is homozygous dominant for freckles. • Timmy mates with Sally, who is heterozygous for freckles. ● Timmy's father and Timmy's mother are both heterozygous for freckles. Timmy's maternal grandmother (mother's mother) is homozygous recessive for freckles. • Timmy's maternal grandfather (mother's father) is homozygous dominant for freckles. Use the information provided to complete the three separate Punnett squares below. Grandma Grandpa Dad Timmy13:10 l 5G Done Photo Use the following information to answer question 3. In sheep, white wool is a dominant trait and black wool is a recessive trait. In a herd of 500 sheep, 20 sheep have black wool. Numerical Response: Bb 20 3. In this herd, what is the frequency of the heterozygous genotype? Answer: Record your answer as a value from 0 to 1, rounded to two decimal places.Please answer fast The phenotypes of organisms are products of genetics, environment, and gene x environment interactions. Describe how genes and environment interact to determine phenotypes using real-life examples.