Suppose a woman has four sons, and two are color blind but have normal blood clotting and two have hemophilia but normal color vision. What is the probable genotype of the woman?

In humans, the genes for red-green color blindness (R = normal, r = color blind) and hemophilia A (H = normal, h = hemophilia) are both X-linked and only 3 map units apart.

A) H R / h r
B) H r / h r
C) h r / h R
D) H r / h R
E) H R / H r


D) H r / h R

Biology & Microbiology

You might also like to view...

When a neuron membrane potential becomes less negative, it is said to be ____

a. depolarized b. hyperpolarized c. repolarized d. damaged e. activated above the threshold potential

Biology & Microbiology

Which of the following is a characteristic of eukaryotic replications?

a. multiple origins of replication b. replication rate of 1,000 nucleotides/second c. circular chromosome structure d. lack of telomerase

Biology & Microbiology

In a typical adult human about 180 L of fluid leaves the blood as filtrate each day, and ____ is

reabsorbed.

a. ~50 percent b. ~65 percent c. ~80 percent d. ~90 percent e. over 99 percent

Biology & Microbiology

Which of the following includes all the others?

a. actin b. myofibril c. myosin d. myofilament e. muscle fiber

Biology & Microbiology