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

By observing the first - column of the first set of chromosomes (the shorter one), we can count 6 different letters representing genes.

Step2: Count genes on Chromosome 2

Looking at the first - column of the second set of chromosomes (the longer one), we can count 10 different letters representing genes.

Step3: Count genes on X - chromosome

Observing the first - column of the X - chromosome set, we can count 8 different letters representing genes.

Answer:

a) 6
b) 10
c) 8