zarahh09
Badges: 15
Rep:
?
#1
Report Thread starter 6 months ago
#1
How does polygenic inheritance differ from monohybrid inheritance?
Last edited by zarahh09; 6 months ago
0
reply
qwert7890
Badges: 18
Rep:
?
#2
Report 6 months ago
#2
(Original post by zarahh09)
How does polygenic inheritance differ from monohybrid inheritance?
Mono= one

Hence a monohybrid cross essentially involves only one gene (at one locus). For example, if I were to say height is determined by one gene, with dominant T and recessive t alleles, then this would be an example of monohybrid inheritance because only one gene is involved. So any trait that is influenced by a single gene would be a monohybrid cross.
Example: TT x tt

Poly = many

Now normally it's rarely that only one gene would be influencing a particular characteristic. However, when many genes (2 or more) combined together influence a characteristic, it is called a polygenic inheritance.

Let us consider an example where you have three genes that influence height.
Let's assume the first gene has two alleles= A & a
the second gene has two alleles = B &b
and similarly third gene has two alleles = C&c

Now a polygenic inheritance could mean that AABBCC could cross with aabbcc. Since multiple genes (3 in total) are involved, this is an example of polygenic inheirtance.
2
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

Feeling behind at school/college? What is the best thing your teachers could to help you catch up?

Extra compulsory independent learning activities (eg, homework tasks) (2)
5.71%
Run extra compulsory lessons or workshops (7)
20%
Focus on making the normal lesson time with them as high quality as possible (4)
11.43%
Focus on making the normal learning resources as high quality/accessible as possible (3)
8.57%
Provide extra optional activities, lessons and/or workshops (11)
31.43%
Assess students, decide who needs extra support and focus on these students (8)
22.86%

Watched Threads

View All