Select the best answer. Suppose you cross a black bodied, lobe-eyed fly with a fly that is WT. Your resulting F1 is entirely WT for body color, but has lobe eyes. When you perform the standard F1 cross, you observe a 9:3:3:1 ratio.  What phenotypes correspond to the different parts of this ratio?

Select the best answer. The National Institute of Health created a DNA repository called __________________.

Select the best answer. You are a genetic counselor, and you have been asked by a couple to help them figure out the odds of their offspring being carriers of cystic fibrosis, an autosomal recessive trait. The woman’s father was affected by cystic fibrosis, so she knows that she is a carrier, but is not affected. The man does not know if his biological parents had cystic fibrosis, but he is unaffected. What are the chances of their offspring being carriers of cystic fibrosis, given this information? 

Select the best answer. If you suspect a trait to be sex-linked, what sort of cross should you perform to confirm your suspicion? 

Select the best answer. When examining an autosomal recessive disease on a pedigree, a colored in circle most likely refers to: 

Select the best answer. Imagine you have an orchid species that can have white or green flowers and long or short leaves. These traits are inherited in a simple Mendelian manner where white flowers and long leaves are the recessive traits and green flowers and short leaves are the dominant traits. From a cross of two parents heterozygous for both traits, what fraction of offspring do you expect to have white flowers and short leaves?

Select the best answer. What is the Law of Segregation?

Select the best answer. When conducting a Dominant Backcross (Aa x AA) the expected genotypic ratio is 1 AA : 1 Aa. This logically follows from: 

Select the best answer. What is a gene inherited in two species from a common ancestor?

Select the best answer. If a trait is X-linked recessive, you would expect the F1 generation from a parental cross where the male is affected in the female is unaffected and homozygous to result in: