can't find answer to biology ?

Genetics as it applies to evolution, molecular biology, and medical aspects.

Moderators: honeev, Leonid, amiradm, BioTeam

Post Reply
FredBurroughs
Garter
Garter
Posts: 1
Joined: Sat May 03, 2008 3:05 pm

can't find answer to biology ?

Post by FredBurroughs » Sat May 03, 2008 3:10 pm

if someone could answer this for me, i'd be grateful. i've spent the last 2 nights trying to figure it out....

Attached earlobes are recessive to free earlobes. What genotypic ratio is expected when an individual with attached earlobes mates with an individual heterozygous for free earlobes?

a. 2:1
b. 9:3:3:1
c. 1:1
d. 1:2:1
e. 3:1

I have a really unhelpful Biology book, so if someone could explain the answer, that would be great!

User avatar
mith
Inland Taipan
Inland Taipan
Posts: 5345
Joined: Thu Jan 20, 2005 8:14 pm
Location: Nashville, TN
Contact:

Post by mith » Sat May 03, 2008 5:32 pm

Living one day at a time;
Enjoying one moment at a time;
Accepting hardships as the pathway to peace;
~Niebuhr

Cat
King Cobra
King Cobra
Posts: 635
Joined: Thu Feb 14, 2008 7:40 pm

Post by Cat » Tue May 13, 2008 12:15 am

Attached earlobes (a) are recessive to free earlobes (A).
What genotypic ratio is expected when an individual with attached earlobes (aa) mates with an individual heterozygous for free earlobes (Aa)?

Aa x aa => 50% Aa + 50% aa => 1:1

Post Reply

Who is online

Users browsing this forum: Bing [Bot] and 1 guest