CAIE IGCSE Biology 17.4.6 Defining Heterozygous

Practise identifying heterozygous genotypes as two different alleles of a particular gene.

Exam points

define heterozygous as having two different alleles of a particular gene
identify one dominant and one recessive symbol, or two distinct codominant symbols, as heterozygous
select heterozygous parents or offspring from a genetic diagram

[Maximum number: 1]

Anthocyanin is a red pigment found in carnation flowers. Some carnation plants have a gene for making anthocyanin.

Carnation plants show co-dominance for the anthocyanin gene. There are two alleles:
- $\quad \mathbf{F}^{\mathbf{A}}$ - allele for anthocyanin pigment (red flowers)
- $\mathbf{F}^{\mathbf{N}}$ - allele for no anthocyanin pigment (white flowers)

State the genotype of a carnation plant that is heterozygous for this gene.

$\mathrm{F}^{\mathrm{A}} \mathrm{F}^{\mathrm{N}}$ ;

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17.4.6—Heterozygous as having two different question 1