Select the best answer. Suppose you cross a black bodied, lo…

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. You are a genetic counselor, and you…

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. Imagine you have an orchid species t…

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?