Heterozygous are individuals who have two different alleles at the same locus, whereas a homo-zygous have the same allele. This is a case of complete dominance.
- In this case, the female Z is heterozygous (genotype Bb). It is for that reason that the cross between the male and female Z produced both black mice and brown mice.
- Moreover, female W is homo-zygous dominant for the allele 'black' (genotype BB). It is for that reason that the cross between the male and female W produced only black mice.
- Finally, the male is homo-zygous recessive for the allele 'brown' (genotype bb).
- This is a case of complete dominance for the black-haired trait because the cross between a recessive male (bb) and a dominant female (BB, female W) produced only black mice progeny.
- Complete dominance occurs when one dominant allele completely masks the expression of the recessive allele in heterozygous individuals for a given locus.
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