Question 1
The enhancers that are present near a gene are present in every cell in an organism, yet these enhancers can have tissue-specific effects on gene expression. Explain how enhancers could have tissue-specific effects on gene expression.
Question 2
The gene encoding coat color is X-linked, and male cats have a single copy of the X chromosome. They can therefore express either the
O or
o allele, resulting in orange or black coat, respectively. Female cats, on the other hand, have two copies of the X chromosome. Thus, they can be heterozygous and express either orange or black in a pattern called tortoiseshell. Using this information, list the possible genotypes for these individuals:
•
orange male
Color-enhanced magnetic resonance image (MRI) showing a sagittal view of the head.
Male Skeleton
Color Coding in the Retina
The karyotype of a triploid individual contains three copies of each chromosome.