Question

i need some help with this lab ASAP please!

HUMAN GENETICS It to study because of the relatively long life span and the limited number In addition, the number of chromosome pairs (23) increases the possible number of genetic combinations. It is possible, however, to take a sample from human frequency of a trait and the possible ways a given trait is inherited. populations to estimate the Objectives .Investigate the inheritance of some human traits. Estimate the frequency of selected traits in a given population. Estimate the genetic probability of the occurrence of representative traits. Materials PTC papers (phenylthiocarbamide) Sodium Benzoate papers. Thiourea papers Forceps Colored Pencils Two Coins (to flip) Trait sketches and photos provided in lab Methods: Part I. Geneticists probably know more about blood types than any other inherited human trait. In the ABO" blood group system the presence or absence of A and B antigens (mucopolysaccharides on the cell surface) determines the four basic blood types. For laboratory purposes consider the ABO blood groups to be determined by a single pair of genes expressing codominance. Thus, the genotype of type A blood may be homozygous (IAA) or heterozygous (14). The genotype of type B blood may be homozygous (l8l8) or heterozygous (IPi). Type O blood must be homozygous (ii). Type AB blood must have both A and B antigens (8) with both being expressed through codominance. Using the Punnett Square provided on the Answer sheet determine the genotypes possible among the offspring of a cross between a heterozygous type A parent and a type AB parent. Use the information provided above, and the results of the Punnett Square, to answer questions 1 through 5 The left-hand column of Table 1 provides a list of parental crosses based on their respective blood types 1. 2. Determine (1) all of the genotypes possible for the respective pairs of parents (2) all of the genotypes possible for the offspring of the respective pairs of parents (3) all of the blood types (phenotypes) possible for the offspring of the respective pairs of parents, and (4) all of the blood types NOT POSSIBLE for the offspring of the respective pairs of parents. Enter your results in the spaces provided in Table 1 Part ll. An inherited trait is symbolized an assigned letter. Normally the dominant form of a trait is symbolized by an upper-case letter (e.g. E), and the recessive form is symbolized as a lower case of the same letter (eg. e). Read the descriptions of the traits listed below and determine whether you are dominant or recessive for each trait. Record the letter for each of your traits in the space provided in Table II. Use only a single letter since you don't know whether you are homozygous or heterozygous for

Answer 1

PART I

1) What are the genes possible in the gametes produced by type A parent?

A- If parent is homozygous, gametes will have I^A and I^A alleles. If the parent is heterozygous, the gametes will have I^A and I allele.

2)What are the possible combinations of offsprings?

• I^AI^A × I^Ai
• I^AI^A × I^BI^B
• I^BI^B × I^Bi
• I^Ai × I^Bi
• I^AI^{A ×} I^Bi
• I^BI^B × I^Ai

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