Question

identify the phenotype by writing the trait after the genotype.
brown eyes are dominant to green eyes. fill in the blanks with \brown\ or \green\ eyes
a full head of hair is dominant to baldness. fill in the blanks with \hair\ or \bald\
curly hair is dominant to straight hair. fill in the blanks with \curly\ or \straight\
tongue rolling is a dominant trait, so rollers are dominant and non rollers are recessive
fill in the blanks with
oller\ or
on roller\
apply your new knowledge to the twins scenario.
brown hair is recessive, red hair is dominant. provide the genotype (alleles/letters)
for the phenotype, use the letter r.
freckles are dominant, no freckles are recessive. provide the genotype (alleles/letters)
for the phenotype, use the letter f.

Explanation:

Step1: Determine phenotype from genotype (dominant - recessive rules)

When a trait is dominant (e.g., brown eyes \(B\), full hair \(H\), curly hair \(C\), tongue - rolling \(T\)), the presence of at least one dominant allele (e.g., \(B\) in \(BB\) or \(Bb\), \(H\) in \(HH\) or \(Hh\), \(C\) in \(CC\) or \(Cc\), \(T\) in \(TT\) or \(Tt\)) shows the dominant phenotype. For recessive traits (e.g., green eyes \(b\), baldness \(h\), straight hair \(c\), non - roller \(t\)), two recessive alleles (e.g., \(bb\), \(hh\), \(cc\), \(tt\)) are needed.

Step2: Determine genotype from phenotype (dominant - recessive rules)

For a dominant phenotype (e.g., red hair (dominant \(R\)), freckles (dominant \(F\))), the genotype can be homozygous dominant (\(RR\), \(FF\)) or heterozygous (\(Rr\), \(Ff\)). For a recessive phenotype (e.g., brown hair (recessive \(r\)), no freckles (recessive \(f\))), the genotype must be homozygous recessive (\(rr\), \(ff\)).

Answer:

Genotype (Eyes)	Phenotype (Eyes)	Genotype (Hair - presence)	Phenotype (Hair - presence)	Genotype (Hair - texture)	Phenotype (Hair - texture)	Genotype (Tongue - rolling)	Phenotype (Tongue - rolling)	Genotype (Hair - color)	Phenotype (Hair - color)	Genotype (Freckles)	Phenotype (Freckles)
\(Bb\)	Brown	\(hh\)	Bald	\(CC\)	Curly	\(tt\)	Non - roller	\(rr\)	Brown Hair	\(ff\)	No Freckles
\(bb\)	Green	\(HH\)	Hair	\(Cc\)	Curly	\(Tt\)	Roller