CLASSWORK: Mendel’s Work Study Guide Name______________________________Period______
Circle the dominant allele:
Black Fur = B
P generation
X
White Fur = b
B _?_ bb
F
1
Generation bb B __?__ B __?__ B __?__
1. An organism’s traits are controlled by the alleles it inherits from its parents.
2. How many alleles do you have for a single trait? 2
3. Is the white mouse in the P generation a hybrid or a purebred? PUREBRED
How do you know? HAS 2 OF THE SAME ALLELES ALSO SHOWS A RECESSIVE
TRAIT
4. Is the black mouse in the P generation a hybrid or a purebred? HYBRID
How do you know? MUST BE A HYBRID TO HAVE A WHITE MOUSE OFFSPRING –
EACH BABY MOUSE MUST GET 1 ALLELE FROM EACH PARENT SO EACH MUST
HAVE AN ALLELE FOR WHITE TO SEE A WHITE BABY
5. What allele would you use to replace the question mark in the black mouse A? b
6. What allele would you use to replace the question marks in the F1 generation mice? b
7. If the black mouse in the P generation were purebred, what would you expect the offspring to look like? THEY WOULD BE ALL BLACK BECAUSE ALL WOULD HAVE
1 DOMINANT ALLELE (BLACK)