What binds hormones because of receptors for specific hormones?  

As observed in four o’clocks, for a gene that is inherited in a maternal inheritance pattern, which of the following statements is true?

Type I survivorship curves are typical of species that exhibit __________.  

Biological species consists of groups of ________. 

Which of the following do you think would cause the most detrimental phenotype?

Let’s suppose that three genes affecting eye color, body color, and wing length are on the same chromosome in fruit flies. In a test cross, if the number of recombinant offspring involving eye color and wing length is much higher compared to body color and eye color, these results suggest that

Placental mammals are called _________.  

Two genes are 18 map units apart. In a testcross, what percentage of offspring is expected to be recombinants?

In humans, an individual who is XXY would be

Assuming that 50% of the offspring are male and 50% are female, what is the probability of this couple having a son with long index fingers?