Skip to content

DIHYBRID INHERITANCE

DIHYBRID INHERITANCE  

Gregor Mendel crossed plants which differ in two pairs of contrasting characteristics e.g. seed shape (round or wrinkled seeds) and seed colour (yellow or green seeds). He crossed plants having round and yellow seeds with these having wrinkled and green seeds. The F1 seeds were having round and yellow seeds. Self-pollinating F1 plants produced the F2 plants of four (4) types

  1. Round and yellow seeds : 9
  2. Wrinkled and yellow seeds : 3
  • Round and green seeds : 3
  1. Wrinkled and green seeds : 1

This experiment resulted into Mendel’s second law of inheritance

 

Mendel’s second law of inheritance otherwise known as law of independent assortment of genes state that alleles of genes on different chromosomes assort independently during meiosis

See also  THE CELL - Cell membrane, Cell wall, Plasma Membrane, Endoplasmic Reticulum,

Diagrammatically:

Parents’ genotypes:     RYRY        X          ryry

(Round yellow seed)     (Wrinkled green seed)

 

Gametes:                      RY         RYry          ry

F1:                           RYry   RYry RYry RYry   (all round yellow)

Self pollinating:

RYry      x       RYry

RY       rY        Ry       ry

 

RY Ry Ry Ry
RY (1)

RYRY

(2)

RYrY

(3)

RYRy

(4)

RYry

rY (5)

RYrY

(6)

rYrY

(7)

RyrY

(8)

rYry

Ry (9)

RYRy

(10)

RyrY

(11)

RyRy

(12)

Ryry

Ry (13)

RYry

(14)

RYry

(15)

Ryry

(16)

ryry

 

Round and yellow seeds: (1), (2), (3), (4), (5),   (7), (9), (10), (13)        :  9

Wrinkled and yellow seeds: (6), (8), (14)                                :  3

Round and green seeds:  (11), (12), (15)                 :  3

See also  KINGDOM PROTOCTISTA

Wrinkled and green seeds:  (16)                                                            :  1

 

See also:

arteries

FACTORS AFFECTING TRANSPIRATION

BIOLOGY SSS 2 SCHEME OF WORK

Scheme of work

DENTAL DISEASES

SUBSCRIBE BELOW FOR A GIVEAWAY

Building & maintaining an elearning portal is very expensive, that is why you see other elearning websites charge fees. Help to keep this learning portal free by telling mum or dad to donate or support us. We accept grants, sponsorships & support to help take this to the next big level and reach out to more people. Thank you so much. Click here to donate

Leave a Reply

Your email address will not be published.

School Portal NG
error: Content is protected !!