Acolor blind man without hemophilia (both x-linked traits) marries a woman who is a carrier for both traits. what is the probability they will have a son with both color blindness and hemophilia? hemophilia and color blindness are unlinked genes.

a. 1/1
b. 1/16
c. 1/8
d. 1/4
e. 3/16

Option D.

Explanation:

Both genes are linked to X chromosome. They are  recessive diseases and a heterozygous gene, which means that two different forms of a particular gene are inherited, one from each parent.

CB : Color blindness carrier, healthy

H: Hemophilia carrier, healthy

h: Disease

cb: Disease

Mom: X(CB/H) X(cb/h) (carrier)

Dad: X(cb/H) Y (color blind man, and  dominant for hemophilia - healthy)

Let's make a table

MOM/DAD |  X(CB/H) X(cb/h)   |

X(cb/H)Y    |   X(cb/H) X(CB/H)  |   Healthy girl for H, carrier for cb

X(cb/H)Y    |   X(cb/H) X(cb/h)   |    Healthy girl for H, sick for cb

X(cb/H)Y    |   Y  X(cb/h)    |  Boy sick for cb and h  

X(cb/H)Y    |   Y  X(CB/H)    |  Boy healthy for CB and H

1 probable case, over 4 possible cases

it’s lava came from an explosive eruption

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.