Maria carries two genes for brown eyes (bb), and john carries two genes for blue eyes (bb). (assume that brown dominates over blue). their child will have a:

Their child will have brown eyes because brown allele is dominant.

Explanation:

Eye Color

– Brown eyes B

– Blue eyes b

Purebred individual with brown eyes (BB)

– Homozygous

Purebred individual with blue eyes (bb)

– Homozygous

Hybrid individual with brown eyes (Bb)

– Heterozygous

Eye Color

– Mother is (BB)

– Father is (bb)

Their Genes Are Crossed

– BB x bb

– Since we are looking at only 1 gene, it is called a monohybrid cross.

Law of Segregation

– Alleles for the same trait must be in separate sex cells.

– Mother is (BB) as his diploid genotype

– Father is (bb) as her diploid genotype

Somatic Cells BB                  bb  

Sex cells          B   B             b      b

So according to the punnett square.

B        b             b

         Bb          Bb

B         Bb         Bb

Bb shows that the child will have brown eyes as B allele is dominant over b allele.

Bb = Brown

All of the  offspring will  have brown eyes,  but they will be  heterozygous

individuals

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