1. Given the following parental genotypes‚ show all possible gametes that each could form. Circle each gamete. Note: different gamete types are separated by commas in the table below. Genotype Gametes: AA A Aa A‚ a Bb B‚ b bb b cc c AABB AB AAbb Ab Aabb Ab‚ ab AaBb AB‚ Ab‚ aB‚ ab AaBbCc ABC‚ ABc‚ Abc‚ AbC‚ aBc‚ aBC‚ abC‚ abc 2. In summer squash‚ white fruit color (W) is dominant over yellow (w). If a squash plant homozygous for white is crossed with one homozygous for yellow‚ what will be the apearance
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Genetics Practice Test Multiple Choice Identify the choice that best completes the statement or answers the question. ____ 1. Pea plants were particularly well suited for use in Mendel’s breeding experiments for all of the following reasons except that a.|peas show easily observed variations in a number of characters‚ such as pea shape and flower color.| b.|it is possible to control matings between different pea plants.| c.|it is possible to obtain large numbers of progeny from any given
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Whether he/she is homozygous or heterozygous (7)______Phenotype__________- the manner in which genotype is expressed - Example: the presence of a widow’s peak or not‚ blue vs brown eyes‚ etc. Monohybrid - one pair of alleles determine a trait. (Most traits are not determined by a single allele pair‚ but these will be used as an example). Use of Punnett Square - a grid used to determine the possible genotypes‚ and thus resulting phenotypes of offspring. Utilizes the alleles of both parents. Sex Linked
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b. genotype 2. Dominant alleles are represented by: a. an upper case letter b. a lower case letter c. it does not matter what type of letter is used 3. In fruit flies‚ gray body color is dominant over black body color. Using the letter G to represent body color‚ what is the genotype of a heterozygous gray bodied fly? a. GG b. gg c. Gg d. GGgg 4. All of the offspring of two gray bodied flys are also gray. What can you conclude about the genotypes of the
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that are additive in their effects. Further assume that each allele represented by an uppercase letter contributes 4 g to weight and that each allele represented by a lowercase letter contributes 1 g to weight. If a plant with genotype AA BB is crossed with a plant with genotype aa bb‚ what weights are expected in the F1 progeny? A. 1 g B. 4 g C. 8 g ****D. 10 g Phenotypic variation in tail length of mice has the following components: What is the broad-sense heritability of tail length
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Mark scheme June 2002 GCE Biology B Unit BYB4 Copyright © 2002 AQA and its licensors. All rights reserved. The Assessment and Qualifications Alliance (AQA) is a company limited by guarantee registered in England and Wales 3644723 and a registered charity number 1073334 Registered address: Addleshaw Booth & Co.‚ Sovereign House‚ PO Box 8‚ Sovereign Street‚ Leeds LS1 1HQ Kathleen Tattersall: Director General klm SECTION A Question 1 (a) GCE: Biology B – BYB4 June 2002 X = grana/lamellae/thylakoid
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that environment may or may not survive‚ depending on the changes. Some organisms will adapt to the changes‚ and some will not. In which of the simulated environments do individuals of the genotype Aa survive best? Urban and Grassland In which of the simulated environments do individuals of the genotype aa survive best? Desert and Rocky Which set of data represents a type of natural selection that stabilizes the allele frequencies of the population? The frequencies are pretty even around 50%
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Always make sure the Initial Genotype Frequencies and Natural Selection Genotype Viability are the same values for all Genotypes. To determine the “a” allele 1-“A” allele To determine the “A” allele 1-“a” allele The population that is closest to being In the Hardy-Weinberg equilibrium experiment is the control because the population is larger. Effect of Natural Selection Genotype and Allele Frequencies We want to compare the results when the Natural Selection Genotype Viabilities are different
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i. Allele ii. Genotype b. Dominant alleles are represented by: i. an upper case letter ii. a lower case letter iii. it does not matter what type of letter is used c. In fruit flies‚ gray body color is dominant over black body color. Using the letter G to represent body color‚ what is the genotype of a heterozygous gray bodied fly? i. GG ii. gg iii. Gg iv. GGgg d. All of the offspring of two gray bodied flys are also gray. What can you conclude about the genotypes of the parent flies
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other allowing two traits to be monitored at once. With these laws‚ ratios can be assigned to both the Monohybrid‚ a cross of only one gene‚ and a dihybrid cross‚ a cross of two independent genes‚ which will result in ratios for both phenotype and genotype. The phenotypic ratio for a standard F1 monohybrid cross is 1:2:1 while a dihybrid cross has a phenotypic ratio of 9:3:3:1. The genotypic ratio of for a monohybrid cross though is 3:1 as the dominant allele will generally over power the recessive
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