Question

Character	Traits	Allele
Hair texture	Dominant-curly Recessive-straight	H h
Eye color	Dominant-brown Recessive-blue	E e
Nose width	Dominant-wide Recessive-narrow	N n

1. Using the table above, rewrite SueBob’s genotype.

2. Describe Baby SueBob’s phenotype.

3. When SueBob grows up, she starts a family with HenryJane. His genotype is HheeNn. Describe HenryJane’s phenotype.

4. Complete a Punnett square to predict the probabilities of hair texture among their children.

HenryJane’s Sperm

                                                            SueBob’s eggs

5. Complete the dihybrid cross to predict the probability of eye color AND nose widths of their children.

                                                                        SueBob

HenryJane

Phenotypic ratios

Brown eyes and wide nose:

Brown eyes and narrow nose:

Blue eyes and wide nose:

Blue eyes and narrow nose:

Answer 1

Based on the given information, SueBob’s genotype is HhEeNn.

Since in a heterozygote all the dominant phenotypes will be expressed, Suebob's Phenotype is: curly hair, brown eyes and wide nose.

HenryJane has genotype: HheeNn. So HenryJane’s phenotype is : curly hair, blue eyes, wide nose.

Punnett square to predict the probabilities of hair texture among their children:

	H	h
H	HH	Hh
h	Hh	hh

So 3/4th of their children will have curly hair and 1/4th will have straight hair.

Dihybrid cross to predict the probability of eye color AND nose widths of their children. Please see image below:

EeNn x eeNn EN En eN en en EeNN EenN eeNN eenN en EeNn Eenn eeNn eenn eN EeNN EenN eeNN eenN en EeNn Eenn eeNn eenn

Phenotypic ratios

Brown eyes and wide nose: 6:16

Brown eyes and narrow nose: 2:16

Blue eyes and wide nose: 6:16

Blue eyes and narrow nose: 2:16

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