Introduction To Genetics And Evolution Coursera Quiz Answers -
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Q1: Two genes are said to be “linked” if they are:
Answer: B Explanation: Linkage is physical proximity on the same chromosome. Far apart genes act like they are unlinked due to crossing over.
Q2: If 20% of offspring from a test cross are recombinant, the map distance between the two genes is:
Answer: B (20 cM) Explanation: 1% recombination = 1 centiMorgan (cM). So 20% = 20 cM.
Q3: Crossing over occurs during which stage of meiosis?
Answer: A (Prophase I) Explanation: Specifically during the pachytene stage when homologous chromosomes pair up as bivalents.
Q4: You observe 40 recombinant offspring and 160 parental offspring out of 200 total. What is the recombination frequency?
Answer: B (20%) Explanation: 40 / 200 = 0.20 = 20%.
Q5: A three-point test cross is superior to two-point crosses because it:
Answer: B Explanation: Double crossovers make two distant genes appear closer. Three-point crosses correct for this.
This week introduces the Punnett square and breaks the common myths of dominant/recessive.
This is where Mendelian genetics gets complicated. Genes on the same chromosome don’t always assort independently.
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“Introduction to Genetics and Evolution” is consistently ranked as one of the best online biology courses available. Taught by the charismatic Professor Mohamed Noor at Duke University, this course bridges the gap between molecular biology (DNA, genes, mutations) and population genetics (natural selection, drift, evolution).
However, the quizzes are notoriously tricky. They test nuance, not just memorization. You might know what a “nucleotide” is, but can you predict the outcome of a cross involving X-linked traits in a species where females are the heterogametic sex?
This guide provides verified answers for all weekly quizzes, plus detailed explanations so you understand the why behind each answer.
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