Biology
Biology
5th Edition
ISBN: 9781260487947
Author: BROOKER
Publisher: MCG
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Chapter 44.5, Problem 2CS
Summary Introduction

To draw: A Punnett square and a pedigree to predict the ratios of genotypes and phenotypes of offsprings from a color-blind mother and a father with normal color vision.

Introduction: The defective ability by which a person cannot see a color or cannot tell differences in color is termed as color blindness. There are several types of color blindness such as red-green color blindness, blue-yellow color blindness and so on.

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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):
Name Period into the genetics problem. Genetics Worksheet # 2 1. In pea plants, smooth peas (S) are dominant to wrinkled peas (s). Work the following crosses. a. homozygous dominant x recessive Genotypes: Phenotypes: Genotypic ratio: Phenotypic ratio: b. heterozygous x heterozygous Genotypes: Phenotypes: Genotypic ratio: Phenotypic ratio: 2, A man and his wife are both heterozygous for brown eyes (B). They have six children all of whom have blue eyes> How can this happen? List the genotypes of the parents and the children. Show the Punnett square. Parents: Kids: What is the chance that the next child will have blue eyes?
Activity 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?
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