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TEST CROSS How to tell the difference between homozygous and heterozygous individuals that have dominant phenotypes © 2007 Paul Billiet ODWSODWS
Selfing or test cross? Plants can be selfed Homozygous plants (AA) are pure breeding Heterozygotes (Aa) will give 75% dominant (AA and Aa) and 25% recessive (aa) phenotypes in their offspring Animals are not usually hermaphroditic so they cannot be selfed Animals require a test cross to be carried out (though these days a gene probe is more likely to be used). © 2007 Paul Billiet ODWSODWS
Coat colour in mice TraitsAllelesGenotypesPhenotypes GreyGGGGrey WhitegGgGrey ggWhite Grey mice could have one of two different genotypes, GG or Gg. If they are crossed with a white mouse (gg) these genotypes will give two different results © 2007 Paul Billiet ODWSODWS
Homozygous Grey Phenotypes x White GenotypesGGgg GametesGGgg gg GGg G OffspringGreyWhite 100%0% © 2007 Paul Billiet ODWSODWS
Heterozygous Grey Phenotypes x White GenotypesGggg GametesGggg gg GGg ggg OffspringGreyWhite 50% © 2007 Paul Billiet ODWSODWS
Genetics the study of hereditary variation © 2007 Paul Billiet ODWSODWS.
Whether a trait is dominant or recessive DOES NOT have anything to do with how common it is.
Steps to solving Punnett Squares. Example # 1 In a certain species of mouse, pointed ears are dominant over round ears. Predict the genotypes and phenotypes.
Genetics Terminology Dominant - trait which stays visible Recessive - trait which disappeared Alleles - alternate forms of a gene for a trait Genotype.
Punnett Square Part 2 A punnett square is used to show the possible allele (gene) combinations for the offspring of 2 parents. The four boxes represent.
In pepper plants, green (G) fruit color is dominant to red (g) and round (R) fruit shape is dominant to square (r) fruit shape. A) What gamete types.
Probability and Genetics Fruit Fly Color and Probability.
Punnett Squares; #3 & #4. #3 Silkworms Copy the parts in RED Dominant gene: yellow cocoon (C) Recessive gene: white cocoon (c)
Genetics The study of heredity (how traits are passed on from generation to generation.)
Intro to Genetics. Human Chromosomes Mendels Work Gregor Mendel- b Father of Genetics Studied 7 different traits: seed shape & color, seed coat.
Monohybrid Crosses These crosses involve one pair of contrasting traits. There are 5 different types which we will discuss.
Single-Factor Punnett Square Notes. Punnett Square A diagram that can be used to predict the gene combinations that might result from a cross.
Mendel Mendel Genetic † Potpourri FINAL JEOPARDY! FINAL JEOPARDY!
Punnett Squares. A Punnett square illustrates how the parents alleles might combine in offspring. A Punnett square illustrates how the parents alleles.
Biology 2B Genetics. Genetic problems A monohybrid cross is a cross of individuals looking at a characteristic inherited at one gene locus A test cross.
Concept check The physical appearance of a trait is called as: a)Morphology b) Phenotype c)Genotype d)Homology What is the alternate form of a gene called?
M endel‘s Law of Segregation Gregor Mendel ( ) He was a monk and in his spare time he performed experiments on garden peas, mice and bees in.
Genetics Quiz #2 PUNNETT SQUARES. Question #1: A white flowered plant is crossed with a plant that is heterozygous for the trait. What percentage of the.
Genetic technology 13.1 Applied Genetics. Genetic Technology What are some desired traits that we might want to select for in these foods?
Patterns of Heredity Multiple Inheritance, Pedigrees and other “fun” genetic stuff...
Gregor and his peas. Early theories suggested that offspring were a blend of their parents factors (called the “Blend Theory”). This could not explain.
Essential Vocab Genotype – the symbolized form; gene forumula (ex: BB) Phenotype – physical appearance/description (ex: brown) Homozygous – 2 genes that.
Punnett Square Practice Problems. Create a punnett square to determine percent probabilities of genotypes and phenotypes of the offspring of a pea plant.
Chapter 5. Mendel’s Work Gregor Mendel’s work allowed us to understand why plants and animals are the way they are. Hereditary is the passing of physical.
Year 10, Pathway C From a previous lesson... Variation is the differences between the characteristics found within a species (controlled by.
As in monohybrid crosses, you can’t tell by looking at the dominant trait whether it is homozygous or heterozygous.
Genetics is the study of how traits are inherited in offspring.
Year 10 genetics continued Inheritance of One Pair of Characteristics.
Heredity - the passing of physical traits from parent to offspring Gregor Mendel - the father of genetics Crossbred pea plants and found that there were.
Genetics and Inheritance Alleles and Appearance. Diploid zygote Haploid gametes.
Continuing with Mendel. A recap from last class: Mendel found that we get one factor from each parent The F1 generation of a cross between a true-breeding.
Genetics and Punnett squares. Activity #1 Cross a purebred short pea plant with a hybrid tall pea plant (tt x Tt). What will the phenotype and genotype.
Kobe Lottery Directions: I am going to roll 6 dice…one at a time. If you guess the 6 numbers in order, you will win a prize.
Genetics Practice. Incomplete Dominance In carnations, red and white phenotypes have homozygous genotypes. The heterozygous genotype makes a pink phenotype.
Simple genetics example Albino rabbits have white coats and red eyes. This is due to lack of the pigment melanin Albinos are actually rather rare in the.
Mr. Altorfer Science Traits and Inheritance Pages 120 to 125.
Rat Genetics. Male Rat (Dad) Phenotype –Black Hair Genotype –BB / Bb.
In peas, tall is dominant to short and green pods are dominant to yellow pods. There is a pea plant that is tall and green, but it’s “mother” was short.
GENETICS & INHERITANCE. INHERITED CHARACTERISTICS Leaf shape in plants Coat colour in guinea pigs Tongue rolling ability Hair & eye colour These.
Probability can be used to predict the results of genetic crosses. Probability- the likelihood that something is going to happen. In genetics expressed.
Define the following terms: – Homozygous – Dominant – Law of segregation – Monohybrid cross – F1 generation – Test cross Who was Mendel and what did he.
Hoover High School Mr.Plazaks Biology : Write an answer here What was the name of the plant that Mendel worked with?
Heredity Notes Chapter 3. Mendel and His Peas Heredity is the passing of traits from parents to offspring. Self pollinating plants have both male and.
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Genetics Punnett Square Problems Gray fur is dominant in mice over white. A purebred gray mouse is crossed with a hybrid female. What color fur may their.
Animal Genetics: Animal Genetics: Dominant vs. Recessive Traits Intro to Agriculture Science.
Jumpstart 11/27 Create a Venn Diagram comparing monohybrid and dihybrid crosses. Your venn should have at least 5 differences and 3 similarities.
SINGLE TRAIT PUNNETT SQUARE Tt T t T t ¼ Punnett Squares.
Genetics 1 Review Segregation Genotype and Phenotype Incomplete dominance and codominance Genetics 2.
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