LAB 03 CRITICAL THINKING

.pdf

School

East Los Angeles College *

*We aren’t endorsed by this school

Course

111

Subject

Biology

Date

Apr 3, 2024

Type

pdf

Pages

Uploaded by DrCrow10996

LAB 03 CRITICAL THINKING QUESTIONS Due No due date e Points 15 e Questions 15 e Time Limit None Attempt History Attempt Time Score LATEST Attempt 1 32 minutes 7 out of 15 Score for this quiz: 7 out of 15 Submitted Feb 21 at 11:26am This attempt took 32 minutes. Question 1 1/1 pts (Q001) Describe the two laws of inheritance put forward by Gregor Mendel. For each, also describe how you think modern genetics has clarified or supported these early concepts. Your Answer: Gregor Mendel proposed two laws of inheritance: the Law of Segregation and the Law of Independent Assortment. Law of Segregation states that during gamete formation, pairs of alleles separate so that each gamete receives one allele from each parent. Law of Independent Assortment states that genes for different traits are sorted independently of each other during gamete formation. Modern genetics has supported these early concepts by demonstrating that allele segregation is determined by the number of chromosomes and the law of independent assortment is determined by the genes being on different chromosomes. Question 2 0/1pts (Q002) Use the Punnett squares you completed in Exercise 1 on p.69 of your lab manual to answer Parts a and b. Part a. Timmy was homozygous dominant for the freckles trait. Looking at the Punnett square for his parents’ mating, what was the probability of Timmy having a different genotype? What was the probability of Timmy having a different phenotype?

different genotype: 0%, different phenotype: 0% You Answered different genotype: 25%, different phenotype: 75% Correct Answer different genotype: 75%, different phenotype: 25% different genotype: 50%, different phenotype: 50% FEEDBACK: Looking at the Punnett square for his parents' mating, Timmy had a 75% chance of having a different genotype (50% chance of Ff; 25% chance of ff). Howeuver, since having a genotype of Ff would have given him the same phenotype, there was only a 25% chance of having a different (recessive) phenotype. Question 3 1/1 pts (Q003) Part b. Timmy's mother was heterozygous for the freckles trait. Looking at the Punnett square for his grandparents' mating, what was the probability of Timmy's mother having a different genotype? What was the probability of Timmy's mother having a different phenotype? Correct! different genotype: 0%, different phenotype: 0% different genotype: 25%, different phenotype: 75% different genotype: 75%, different phenotype: 25% different genotype: 50%, different phenotype: 50% FEEDBACK: Looking at the Punnett square for the grandparents' mating, Timmy's mother had a 0% chance of having a different genotype. Her mother was homozygous recessive whereas her father was homozygous dominant, which means that all their children could only be heterozygous for trait F. Since Timmy's mother had a 0% chance of having a different genotype, she also has a 0% chance for having a different phenotype. Question 4 0/1pts (Q004) Complete the chart on p. 79 of your lab manual comparing Punnett squares and pedigree diagrams. For each characteristic, indicate whether Punnett squares, pedigree diagrams, or both have that characteristic by placing a mark in the appropriate column. Answer Parts i-viii about the chart. Part i. Which show one mating at a time? Correct Answer Punnett squares pedigree diagrams

You Answered both Punnett squares and pedigree diagrams FEEDBACK: Punnett squares only show one mating at a time, whereas pedigree diagrams show more than one mating. Question 5 0/1pts (Q005) Part ii. Which show multiple generations at a time? You Answered Punnett squares Correct Answer pedigree diagrams both Punnett squares and pedigree diagrams FEEDBACK: Pedigree diagrams show multiple generations at a time, whereas Punnett squares show only one generation. Question 6 1/1 pts (Q006) Part iii. Which show phenotypes? Punnett squares Correct! pedigree diagrams both Punnett squares and pedigree diagrams FEEDBACK: Pedigree diagrams show phenotypes, whereas Punnett squares do not. Question 7 0/1pts (Q007) Part iv. Which require you to infer phenotypes? Correct Answer Punnett squares pedigree diagrams You Answered both Punnett squares and pedigree diagrams

Your preview ends here

Eager to read complete document? Join bartleby learn and gain access to the full version