Question

name _____________________________ period ____ page # 136
do you want to build a snowman genetics vocabulary?
define the following:
dominant -\t\t\tallele -
recessive -\t\t\thomozygous -
genotype -\t\t\theterozygous -
phenotype -

use the information from the data table to write the phenotypes for the following genotypes.

1. ee -\t\t\t\

$$\begin{tabular}{|c|c|c|} \\hline trait & dominant & recessive \\\\ \\hline \\# of snowballs & three (d) & two (d) \\\\ \\hline nose shape & carrot (n) & button (n) \\\\ \\hline eyes & coal (e) & rocks (e) \\\\ \\hline \\end{tabular}$$

1. dd

1. nn -

1. ee -

1. nn -

label the snowmen as either homozygous dominant (hod), homozygous recessive (hor), or heterozygous (he).

\includegraphicsscale=0.5{snowmen_genetics.png}

6.____ 7. __ 8. __ 9.__ 10.__ 11.____

Explanation:

Definitions are based on basic genetics terms. Phenotypes are determined by matching genotypes to the given trait table (dominant alleles express dominant traits, recessive homozygotes express recessive traits). Genotype classifications depend on whether alleles are identical (homozygous) or different (heterozygous), and if identical alleles are dominant or recessive.

Answer:

Definitions:

• Dominant: Trait expressed over recessive alleles
• Allele: Variant form of a gene
• Recessive: Trait expressed only in homozygous state
• Homozygous: Two identical alleles for a trait
• Genotype: Genetic makeup of an organism
• Heterozygous: Two different alleles for a trait
• Phenotype: Observable physical trait

Phenotypes from Genotypes:

1. EE - Coal eyes
2. dd - Two snowballs
3. Nn - Carrot nose
4. ee - Rocks eyes
5. NN - Carrot nose

Genotype Classifications:

1. Ee - Heterozygous (He)
2. DD - Homozygous dominant (HoD)
3. nn - Homozygous recessive (HoR)
4. Nn - Heterozygous (He)
5. Dd - Heterozygous (He)
6. EE - Homozygous dominant (HoD)