MENDEL & THE GENE IDEA
CHAPTER 14: MENDEL & THE GENE IDEA
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Order Paper Now1. What is the difference between a character and a trait?
2. What is the difference between an individual’s genotype and phenotype?
3. What do we know about the genotype of true-breeding plants in Mendel’s experiments?
4. In Mendel’s experiments, what is the genotype of the individuals in a monohybrid cross (F1 x F1)? What is their phenotype?
5. Are dominant alleles always more common than recessive alleles in a population?
6. What is the law of segregation? This occurs during which phase of meiosis?
7. In complete dominance, do homozygous dominant individuals have the same phenotype as heterozygous individuals? Do they have the same genotype?
8. Mrs. Smith has a widow’s peak (her genotype is Ww), but her husband does not (his genotype is ww).
What are the possible gametes for Mrs. Smith ___________ Mr. Smith _____________
Make a Punnett Square for potential offspring produced by this couple:
What is the probability that their child will have a widow’s peak?
What is the probability that they will have two children both with widow’s peaks?
9. Mendel’s dihybrid cross (F1 x F1) looked at the inheritance of two characters. What were the genotypes of the F1 plants?
Did he find that seed color and seed texture were inherited together or independently? Explain.
10. Besides having a widow’s peak (Ww), Mrs. Smith also has attached earlobes (ff). Mr. Smith does not have a widow’s peak (ww) or attached earlobes (Ff).
Considering both of these characters together, what are the possible gametes
for Mrs. Smith _________________________ and Mr. Smith __________________________?
Make a Punnett Square for both of these characters together.
What is the probability that their child will have a widow’s peak and attached earlobes?
What is the probability that their child will have no widow’s peak NOR attached earlobes?
11. An individual has a genotype WwFf. What are the possible gametes that this person can make in respect to these two genes?
12. In incomplete dominance, do homozygous dominant individuals have the same phenotype as heterozygous individuals?
13. How is codominance different from incomplete dominance?
14. Do most genes only have two alleles?
15. Explain:
Pleiotropy
Epistasis
Polygenic inheritance
16. Give an example of how environment can affect an organism’s phenotype?
17. In a recessively-inherited disorder, what are the genotypes of:
A normal person
A carrier
An afflicted person
18. Why are dominantly-inherited disorders less common than recessively-inherited disorders?
19. Duncan and Maria are both carriers of cystic fibrosis, a recessively-inherited disorder. Draw a Punnett square to show their possible offspring.
What is the probability that their child will have cystic fibrosis?
