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Bio 101 Exam 3 Review Questions And Answers With Verified Solutions Latest Updated 2024
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Bio 101 Exam 3 Review Questions And Answers With Verified Solutions Latest Updated 2024
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Bio 101 Exam 3 Review Questions AndAnswers With Verified Solutions Latest
Updated 2024
What are true-breeding varieties? - ANSWER✔✔ Both dominant and recessive
traits.
When you look at yourself in the mirror, are you observing your genotype or
phenotype? - ANSWER✔✔ Phenotype.
We usually name genes as the first letter of the dominant allele. Mendel's pea
plants can have yellow or green seed color alleles and yellow is the dominant
allele. What letter would we use to represent the gene that codes for seed color? If
a pea plant has a gene on one homolog that codes for yellow and a gene on the
other homolog that codes for green, what is the genotype of the plant? What is the
phenotype? Would we consider this plant to be homozygous or heterozygous for
the seed color gene? What color are the seeds on this plant? - ANSWER✔✔ Gene:
Heterozygous
Color: Yellow
What would be the expected genotypic and phenotypic ratios of offspring in a
cross between a pea plant homozygous for tall height with a heterozygous pea
plant? Show your work in a Punnett square. - ANSWER✔✔ 50% Homozygous
(TT)
50% Heterozygous (Tt)
Define in your own words: heterozygous, homozygous, dominant, recessive. -
ANSWER✔✔ Heterozygous: Is when the genotype of a trait has 2 different alleles.
For Example: Tt
Homozygous: Is when the genotype of a trait has 2 alleles that are the same.
For Example: TT, tt
, Explain Mendel's Law of Segregation. - ANSWER✔✔ Only one of the two alleles
for a gene is put into a gamete. At fertilization, offspring receive from each parent
one allele for each gene.
Three features of Mendel's research, in particular, were critical to its success. What
are they? - ANSWER✔✔ Good Organism To Study:
Easy to maintain, easy to breed, and reproduce quickly.
Easily Categorized Trait:
7 different traits, each trait, only 2 variants ever appeared.
True-Breeding:
Repeatedly breeding similar plants until there are distinct populations.
What is Evolution? - ANSWER✔✔ A genetic change in a population over time.
Can individuals evolve over the course of their lifetimes? - ANSWER✔✔ No, an
individual cannot evolve. They live with the DNA sequence they're born with, and
cannot change it.
Define population. - ANSWER✔✔ A group of organisms of the same species that
has the potential to interbreed.
Could you breed fruit flies who could live longer than 20 hours on average? How?
Describe the experiment. - ANSWER✔✔ Yes. The fruit flies are able to live <20
hours through a series of experiments that increase starvation resistance. In the
experiment, you start with a cage that contains large numbers of the flies. The food
is removed, and once 80% of the fruit flies starve to death, food is returned to the
cage. Average resistance time is recorded. Once remaining fruit flies eat & produce
their eggs, their eggs are collected & experiments are done again in another cage.
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