An achondroplastic male dwarf with normal vision marries a achondroplastic female that is color-blind. Both their fathers were six-feet tall. Achondroplastic dwarfism is autosomal leading, and also red-green shade blindness is X-linked recessive. What propercentage of their sons would be color-blind and also of normal height?

a.

You are watching: What proportion of their sons would be color-blind and of normal height?

1/2

b.

3/4

c.

all

d.

none

e.

1/4


Answer:

d. none

Explanation:

Symbol: D-dwarf d-normal B-normal b-colorblind (dominant is capitalized)

Father (“the man”) : D? BB

Mother (“the woman”) : D? bb (D? for achondroplastic and bb for recessive shade blindness)

Grandfather–Father (“the man”)’s father–ddGrandfather—Father (“the woman”)’s father –dd

As displayed over, the father of guy i.e. grandfather has normal elevation (dd). He will contribute one allele to his offspring (man), so one allele of male must be d. Hence, the male genoform will certainly be Dd BB

Same rationale is applicable for the woman, so her genotype will certainly be Dd bb.

Now, the cross in between guy and also womale will certainly bring about following offspring:

Dd BB X Dd bb

Dbdb
DBDDBbDdBb
dBDdBbddBb

Propercent of sons with color-blindness and normal height (ddbb) is zero.


*
eguy Asked on June 30, 2018 in biology.
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