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7. Explain why a recessive allele can only be expressed when the organism is homozygous.

6. Use the following words to complete this statement: phenotype, genotype, heterozygous, homozygous traits, alleles, genes

Chromosomes contain _____, which help to determine an organism’s ______. Genes come in alternate forms called_____, and both parents may not have the same type of allele. The actual gene combination that an organism receives from its parents is called its _____, while the trait that gets expressed as a result is referred to as its______. If an offspring receives the same type of allele for a given gene from each parent, it is said to be _____ for that trait. If the alleles differ, it is _____.