Name period date assigned date due date returned. Human Traits Lab. Introduction Follow the instructions on the power point to complete this activity.

Transcription

1 Name period date assigned date due date returned Introduction Follow the instructions on the power point to complete this activity. phenotype (which one do you have) dominant or recessive? possible genotype or no straight or curved thumb rolling or nonrolling tongue unattached or attached ear lobes or straight hairline bent or straight pinkies cleft or no cleft chin dominant TOTALS recessive 1

2 lass Data lass Data # of students in class exhibiting the trait # of students in class exhibiting the trait straight thumbs rolling tongue unattached bent pinky no bent thumbs non-rolling tongue attached straight hairline straight pinky no reate a bar graph using the class data. 24 Number of Students with the (by twos) no straight thumbs curved thumb rolling tongue non-rolling tongue unattached attached straight hairline bent pinky straight pinky no Dominant and Recessive Human s 2

3 PART 1: Symbolizing Alleles omplete the table: trait dominant expression symbol recessive expression symbol handedness (R) right handed R left handed r hair line (W) straight hairline ear lobes (F) free (unattached) attached hand folding (L) left thumb on top right thumb on top chin features () no cleft toes (T) second toe longer than big toe second toe shorter than big toe PART 2: Determining the Phenotype In the table below, identify what trait will be seen. The trait that can be seen is called a phenotype. the first example has been done for you. Genotype RR ww FF cc Tt Ll Phenotype (what you can see) the person will be right handed 3

4 PART 3: Determining the Genotype Fill in the table below with the possible genotypes for each phenotype. The first one has been done for you. Genotype RR or Rr Phenotype (what you can see) the person will be right handed left handed straight hairline attached ear lobe free earlobe right thumb on top left thumb on top no cleft second toe shorter than big toe second toe longer than big toe 46 An offspring inherited a dominant allele from one parent and a recessive allele from the other parent for the same trait. Which of the following is a possible explanation for what will be exhibited by the offspring for that trait? A The offspring will exhibit the recessive trait with the dominant trait being masked. B The offspring will exhibit the dominant trait with the recessive trait being masked. D The offspring will not exhibit that trait because the dominant and recessive traits he received will each mask the other. The offspring will combine the recessive allele with the dominant allele and exhibit an entirely new trait. 4

5 47 The ability to roll your tongue is an inherited trait. There are more people who can roll their tongues than people who can t roll their tongues. Which of the following could be a correct assumption to explain this? 49 Different forms of a gene are called F mutations G alleles F The ability to tongue roll is a rare trait. H chromosomes J phenotype G The ability to tongue roll is a recessive trait. H The ability to tongue roll is a dominant trait. J The ability to tongue roll is a submissive trait. 48 Why does a person who inherits an allele for curly hair and an allele for straight hair have curly hair? A The allele for curly hair is recessive. 50 Genetic information responsible for physical characteristics such as eye color, height, hair color and skin color can be found within an organism s - A ribosome B The allele for curly hair is dominant. B golgi body The allele for straight hair is dominant. nucleus D cytoplasm D The allele for curly hair is inherited from both parents. 5