bb x bb e. BB x bb 29. To determine whether an unknown black guinea pig is pure or hybrid black, it should be crossed with a. a white b. a hybrid black c. a hybrid white d. a pure black e. another unknown 30. Organisms that have two identical alleles for a particular trait are said to be a. hybrid b. homozygous c. heterozygous d. dominant 31. A pea plant heterozygous for height and seed color (TtYy) is crossed with a pea plant heterozygous for height but homozygous recessive for seed color (Ttyy). If 80 offspring are produced, how many are expected to be tall and have yellow seeds?
aa What is the genotype of person I3? Aa Test Cross Describe the test cross that a farmer would use to determine the genotype of an animal that shows a dominant trait. Use the following Punnett squares and the letters A and a to explain your answer. cross the animal with a recessive; if the animal is Aa crossed with aa – then ½ of the offspring will be recessive; if the animal is AA crossed with aa – all offspring will show the dominant trait. Mendel’s Laws Explain each of Mendel’s Laws and explain the experiments he used to determine these laws.
2. What might determine whether a person who shows the dominant characteristic is homozygous dominant or heterozygous? When a person shows a dominant trait, their genotype can be homozygous dominant or heterozygous. Homozygous dominant genes are usually noted as two capital letters, while heterozygous genes have one capital and one lowercase letter. This signifies that in heterozygous genes, there is one dominant gene and one recessive, while homozygous genes are both either dominant or recessive.
a. What are the parental genotypes? (Hint: the sex of the parent is important) b. What F1 phenotypic and genotypic ratios are produced from this cross? (Show your Punnett Square) 5.
The Evolution of Populations Study Guide A Answer Key Section 1. Genetic Variation Within Populations 1. B 2. d 3. gene pool 4. combinations of alleles 5. allele frequencies 6. ratio or percentage 7. mutation 8. recombination 9. hybridization 10. gene pool 11. allele frequency Be Creative: Logos may vary but should illustrate the importance of genetic diversity. Section 2. Natural Selection in Populations 1.
Depending on the genetic outcome of DC1, the second discriminant cross, DC2, is made by crossing female wild-type virgins with F1 males if the unknown mutation is dominant, or by crossing F1 males with mutant females if the unknown mutation is recessive. Statistical analyses on these crosses are performed by determining the chi-square values to test for the accuracy of the hypothesis. The null hypothesis is rejected if the chi-square value is lower than critical values on the chi-square distribution table. Results First Genetic Cross: Discriminant Cross 1 The mode of inheritance for the
Note that in all possible cases, each child has an O allele in addition to his/her phenotypic blood expression. A and B are dominant alleles when paired with an O allele and co-dominant when they appear together in the genotype AB. On the other hand, allele O is recessive; therefore both parents must contribute an O allele for their offspring to express type O blood. What possible genotypes result from both parents having type AB blood? | |A |B | |A |AA |AB | |B |AB |BB | This case reveals the two remaining possible genotypes, AA and BB, which express type A blood and type B blood respectively.
PART ONE BLASTN 6a. Briefly explain what information is contained within this summary. This summary includes the identification and name of the species that the sequence originated from, the chromosome number, the accession value, and then the score and the e-value. 6b. Given your knowledge of sequence similarity measures, which color is least desirable?
For example, Booker T. Washington and Frederick Douglass, with slave mothers and white fathers, were referred to as mulattoes. The original purpose of the one-drop rule was to prevent interracial relationships and thus keep the white race "pure." In 1924, Walter Plecker, first registrar of the U.S. Bureau of Vital Statistics wrote, "Two races as materially divergent as the White and Negro, in morals, mental powers, and cultural fitness, cannot live in close contact without injury to the higher." [2] Not only does the one-drop rule apply to no other group than American
Color of eyes, straight or curly hair, pigmentation of the skin and certain diseases are all a function of the genes we inherit. Other physical characteristics, if not determined, appear to be at least strongly influenced by the genetic make-up of our biological parents. Those who adopt an extreme heredity position are known as nativists. Their basic assumption is that the characteristics of the human species as a whole are a product of evolution, and that individual differences are due to each person’s unique genetic code. Characteristics and differences that are not observable at birth, but which emerge later in life, are regarded as the product of maturation.