Multiple Choice
The ability to change phenotype in response to local environmental conditions is called:
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13. Mendelian Genetics
Genotype vs. Phenotype
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If the two alleles for a particular gene are identical the gene pair is:
A
Homozygous.
B
Heterozygous.
C
Recessive.
D
Homologous.
E
Dominant.
F
Dissimilar.
Verified step by step guidance1
Understand the concept of alleles: Alleles are different forms of a gene that are found at the same place on a chromosome. Each individual inherits two alleles for each gene, one from each parent.
Define homozygous: When both alleles for a particular gene are identical, the organism is said to be homozygous for that gene. This means the alleles are the same, either both dominant or both recessive.
Define heterozygous: In contrast, if the alleles are different, the organism is heterozygous for that gene. This means one allele is dominant and the other is recessive.
Clarify related terms: 'Recessive' and 'dominant' refer to the type of allele and its expression in the phenotype. 'Homologous' refers to chromosomes that are similar in shape and size and carry the same genes, but not necessarily the same alleles.
Identify the correct term: Based on the definitions, if the two alleles for a particular gene are identical, the gene pair is homozygous.
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