Hemophilia is a sex-linked trait. If a man and a woman have a hemophilic son, which of the following MUST be true? a)The father is a carrier

b)The mother is a carrier

c)The boy's grandfather has hemophilia

d)Both parents have the disease allele

Imagine ? person stepping on a pin and pulling his or her foot way look at the réfléchir arc of the scenarios below

How is ribosomal rna useful as a molecular clock? a. a large portion of the dna ring is not vital to structure or function, allowing it to accumulate neutral mutations. b. its rate of mutation increases over time as organisms continue to evolve and differentiate from each other. c. a slow mutation rate makes it useful for determining evolutionary relationships between ancient species. d. it is only found in select organisms, making it easier to compare relationships between species that have it.

The body of water found at number 4 on the map above is the