If an organism has two different alleles for a given trait (like attached and free earlobes), they are considered ____________, and in __________ traits we automatically know the genotype.

Question

Genetics P1 and P2 Honors 187 Flashcards | Quizlet

Dominant Recessive

a
recessive, homozygous
b
homozygous, recessive
c
hybrid, dominant
d
heterozygous, recessive

Answer 1

The correct answer is d: heterozygous, recessive.

In genetics, when an organism has two different alleles for a given trait, it is referred to as being heterozygous. For traits that are recessive, we automatically know the genotype when we observe the phenotype; if the phenotype is the recessive trait, we can conclude that the genotype must be homozygous recessive. If the phenotype is dominant, we cannot determine whether the organism is homozygous dominant or heterozygous without further testing.