HEREDITY
THE PEDIGREE
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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heterozygote / carrier
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homozygote / carrier
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heterozygote / affected
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homozygote / affected
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Detailed explanation-1: -A half-shaded circle or square indicates that a person is a carrier of the trait. A completely shaded circle or square indicates that a person expresses the trait. A circle or square that is not shaded indicates that a person neither expresses the trait nor is a carrier of the trait.
Detailed explanation-2: -A completely shaded circle or square shows a person who expresses the trait. A non-shaded circle or square represents a person who is not expressed or carrier of the trait.
Detailed explanation-3: -An example of a heterozygous genotype is one where one allele is dominant and the other is recessive. If both parents are heterozygous for a trait 15% will be have two dominant alleles and be homozygous dominant and 25% will be homozygous recessive. 50% will be heterozygous.
Detailed explanation-4: -Homozygote – an individual that has two of the same alleles for a gene, e.g., BB for a purple pea plant or bb for a white pea plant. Heterozygote – an individual with two different alleles, such as a pea plant that is Bb.