Figure 3 depicts two diploid cells containing two pairs of homologous chromosomes from a male and female of the same species. The larger chromosomes have different alleles of gene D, and the smaller chromosomes have different alleles of gene E. If the male and female mate, predict the genotype and phenotype of the offspring? Show your cross.

An ebony strain of flies was discovered to be sensitive to carbon dioxide. Crossing a female sensitive strain with a male resistant strain gave all sensitive offspring. The offspring of an F1 female crossed with a resistant male were all sensitive.  Simulate a reciprocal cross up to the  F2 generation.  label your reciprocal cross and the colors of the nucleus and the cytoplasm, and the phenotypes of all individuals in the reciprocal cross.  Big green  Male cytoplasm  Big red  Female cytoplasm  Small half-green-half-red  F1 nucleus  Small green  Male nucleus  Small red  Female nucleus

Figure 1. Showing a homologous pair of chromosomes that carry two linked genes. Here we can see that one chromosome carries A and Balleles, while the other homologous chromosome carries a and b alleles. This is much more informative than just giving the genotype of AaBb. Another way to symbolize the arrangement of alleles on a chromosome is to give the symbols for alleles on one chromosome above a horizontal line, and the symbols for the alleles on the homologous chromosome below the horizontal line. For example: A Figure 2. Showing the arrangement of alleles for a pair of linked genes. Here we can see that, exactly like the example in Figure 1, one chromosome carries A and B alleles, while the other chromosome carries a and b alleles. 1. Suppose that Gene G and Gene D are linked. If the genotype of an organism is GGDD, use both types of symbols you learned in Figure 1 and Figure 2 above to show the arrangement of alleles for this organism.

The drawings below represent four possible cells produce by meiosis in a cell pf the genotype AaBb. Examine the figures below and answer the questions that follow: 1. How many different types of cells are produced at the end of Meiosis I?  A  *Write your answer as a word, not a number     2. Is there any other way you could have arranged the chromosomes? For example,                   a.  Could A and a be arranged so that both go to the same cell after Metaphase I (Yes/No)? B                   b.  Could B and b be arranged so that both go to the same cell after Metaphase I (Yes.No)? C                   c.  Could A and B be arranged so that both go to the same cell after Metaphase I (Yes/No)?  D                   d.  Could A and b be arranged so that both go to the same cell after Metaphase I?(Yes./No) E   3. Are the daughter cells haploid, or diploid? F   4.  Do the daughter cells have the same genetic composition as the original cell (Yes/No)? G   5.  Focus on the four daughter cells…