Question

next place each homolog next to one another: should look like the figure below
the different letters on each chromatid represent different loci. each locus contains a gene that codes for a certain trait. did you notice that some letters in homologous chromosomes are in lower case while others are in upper case? the letter represents a character or gene (ex: eye color), and the upper and lower case represent dominance and recessive alleles (ex: g=green eyes; g=red eyes). right now it is not important to know what character each letter represents, but we will get back to it in the next section of the lab.

1. how many genes does your reptilobird have on each of its chromosomes? remember that the chromosomes above are duplicated to form sister chromatids. a chromosome is only one column.

a) chromosome 1 (the shorter one) ____
b) chromosome 2 (the longer one) ____
c) x - chromosome ____

Explanation:

Step1: Count genes on Chromosome 1

Count the number of different letter - loci in one column of Chromosome 1. There are 6 genes.

Step2: Count genes on Chromosome 2

Count the number of different letter - loci in one column of Chromosome 2. There are 10 genes.

Step3: Count genes on X - chromosome

Count the number of different letter - loci in one column of the X - chromosome. There are 8 genes.

Answer:

a) 6
b) 10
c) 8