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For each parent and offspring genotype, is the genotype homozygous recessive,...

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hinkberries | Student, Undergraduate | eNoter

Posted November 12, 2011 at 4:56 AM via web

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For each parent and offspring genotype, is the genotype homozygous recessive, homozygous dominant, or heterozygous?

4 sets of parents

1) BB and Bb
2) BB and bb
3) Rr and Rr
4) rr and rr

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samhouston | Middle School Teacher | (Level 1) Associate Educator

Posted November 12, 2011 at 7:41 AM (Answer #1)

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Use the Punnett Square.

1) BB and Bb

     B     B

B   BB   BB

b   Bb   Bb

2 homozygous dominant, 2 heterozygous

 

2)  BB and bb

     B     B

b   Bb   Bb

b   Bb   Bb

4 heterozygous

 

3) Rr and Rr

     R     r

R   RR   Rr

r    Rr   rr

1 homozygous dominant, 1 homozygous recessive, 2 heterozygous

 

4) rr and rr

     r     r

r    rr   rr

r    rr   rr

4 homozygous recessive

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