Name CHM 1360 Winter 2018 Lab 8 Post-lab worksheet 1. (I point) Examine the clas

Question

Name CHM 1360 Winter 2018 Lab 8 Post-lab worksheet 1. (I point) Examine the class data for the two traits (carlobes attached or unattached, and dimple present or absent). From these data, can you tell which allele for each trait is dominant? Explain your reasoning 2. ( point) In rabbits, black fur (B) is dominant over brown fur (b). A rabbit is mated with a brown rabbit. Do a punnett square to show the cross and predict the offspring (phenotypes and genotypes). hetcrozygous black (2 points) A second trait in rabbits shows that short hair is dominant (S) over long (s). In a cross between a heterozygous black short-haired male and a brown homozygous long- haired female predict the offspring (phenotypes and genotypes using a punnett square. 3.

Explanation / Answer

1. The dominant phenotype will have a higher frequency in this case unattached earlobes.

2. Bb (black) X bb (brown)

b. b

B Bb. Bb

b . bb . bb

Genotypes phenotypes

1. Bb . Black

2. bb. Brown

The ratio for black and brown fur is 1:1

3. BbSs (heterozygous)

bbss (homozygous)

BbSs X bbss

BS. Bs . bS. bs

bs BbSs Bbss . bbSs. bbss

BbSs Black With short hair

Bbss Black with long hair

bbSs brown with short hair

bbss brown with long hair

4. Genotypes of rabbit with short hair

BBSS, BbSS, BBSs, BbSs

5. The rabbit is a heterozygous i.e. it is BbSs

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