MBG2400 Lectures 1 & 2 Questions With Complete
Solutions
How do environmental factors influence genetic diversity?
Correct Answers Different environments can lead to diverse
adaptations and phenotypes in genetically identical organisms.
How do mutations contribute to our understanding of
evolutionary relationships? Correct Answers Mutations that
occurred in the past can persist in populations, helping scientists
trace lineage and common ancestors.
How does crossing over affect genetic diversity? Correct
Answers It allows for mixing and matching of genes between
maternal and paternal chromosomes.
How does crossing over occur during meiosis? Correct Answers
It involves double-strand breaks in DNA followed by the
accurate fusion of broken chromatids.
How does cultural transmission affect genetic expression?
Correct Answers It influences gene expression and overall
fitness, contributing to individual uniqueness.
How does genetic diversification occur across generations?
Correct Answers It is both additive and exponential as progeny
multiply and undergo new recombination events.
How does meiosis contribute to genetic diversity? Correct
Answers Meiosis introduces genetic diversity through
recombination and independent assortment of chromosomes.
,How does temperature affect mutation rates? Correct Answers
An increase in temperature by every 10˚C increases the mutation
rate by 2-3 fold.
How does the germline development differ between higher
animals and higher plants? Correct Answers In higher animals,
the germline is set aside early during embryogenesis, while in
higher plants, there are many mitotic divisions during which
mutations can occur.
How does the process of meiosis ensure genetic diversity?
Correct Answers Through recombination and independent
assortment of chromosomes.
How many genes do humans and corn have approximately?
Correct Answers Humans have about 21,000 genes, while corn
has about 40,000 genes.
How many possible combinations can be formed from 23 sets of
human chromosomes? Correct Answers Approximately
8,388,608 combinations.
Name a chemical mutagen derived from burning organic
materials. Correct Answers Polycyclic aromatic hydrocarbons
(PAHs) are produced from burning natural or industrial
materials.
What are mobile elements in genetics? Correct Answers
Mobile elements, also known as 'selfish DNA', create insertional
, mutations in host chromosomes and include transposons and
retroviruses like HIV.
What are nitrosamines and where are they commonly found?
Correct Answers Nitrosamines are chemical mutagens found in
tobacco, smoked meats, and as preservatives in food.
What are the essential components needed for chemical
reactions to build life? Correct Answers A membrane barrier
that prevents water and random molecules from passing through,
creating a hydrophobic environment.
What are the implications of having many mitotic divisions in
higher plants? Correct Answers It suggests a fundamentally
different life strategy compared to higher animals.
What are the main types of mutations? Correct Answers
Insertions, deletions, substitutions, inversions, and repeat
expansions.
What are the major drivers of genetic diversification in higher
plants and animals? Correct Answers Somatic mutations,
meiosis (recombination and independent assortment), sex, and
inter-generational diversification.
What are the three major tasks completed by meiotic
chromosomes? Correct Answers 1. Reduce homologous
chromosome number from two to one (diploid to haploid). 2.
Chromosome recombination (crossing over). 3. Random
assortment of chromosomes.
Solutions
How do environmental factors influence genetic diversity?
Correct Answers Different environments can lead to diverse
adaptations and phenotypes in genetically identical organisms.
How do mutations contribute to our understanding of
evolutionary relationships? Correct Answers Mutations that
occurred in the past can persist in populations, helping scientists
trace lineage and common ancestors.
How does crossing over affect genetic diversity? Correct
Answers It allows for mixing and matching of genes between
maternal and paternal chromosomes.
How does crossing over occur during meiosis? Correct Answers
It involves double-strand breaks in DNA followed by the
accurate fusion of broken chromatids.
How does cultural transmission affect genetic expression?
Correct Answers It influences gene expression and overall
fitness, contributing to individual uniqueness.
How does genetic diversification occur across generations?
Correct Answers It is both additive and exponential as progeny
multiply and undergo new recombination events.
How does meiosis contribute to genetic diversity? Correct
Answers Meiosis introduces genetic diversity through
recombination and independent assortment of chromosomes.
,How does temperature affect mutation rates? Correct Answers
An increase in temperature by every 10˚C increases the mutation
rate by 2-3 fold.
How does the germline development differ between higher
animals and higher plants? Correct Answers In higher animals,
the germline is set aside early during embryogenesis, while in
higher plants, there are many mitotic divisions during which
mutations can occur.
How does the process of meiosis ensure genetic diversity?
Correct Answers Through recombination and independent
assortment of chromosomes.
How many genes do humans and corn have approximately?
Correct Answers Humans have about 21,000 genes, while corn
has about 40,000 genes.
How many possible combinations can be formed from 23 sets of
human chromosomes? Correct Answers Approximately
8,388,608 combinations.
Name a chemical mutagen derived from burning organic
materials. Correct Answers Polycyclic aromatic hydrocarbons
(PAHs) are produced from burning natural or industrial
materials.
What are mobile elements in genetics? Correct Answers
Mobile elements, also known as 'selfish DNA', create insertional
, mutations in host chromosomes and include transposons and
retroviruses like HIV.
What are nitrosamines and where are they commonly found?
Correct Answers Nitrosamines are chemical mutagens found in
tobacco, smoked meats, and as preservatives in food.
What are the essential components needed for chemical
reactions to build life? Correct Answers A membrane barrier
that prevents water and random molecules from passing through,
creating a hydrophobic environment.
What are the implications of having many mitotic divisions in
higher plants? Correct Answers It suggests a fundamentally
different life strategy compared to higher animals.
What are the main types of mutations? Correct Answers
Insertions, deletions, substitutions, inversions, and repeat
expansions.
What are the major drivers of genetic diversification in higher
plants and animals? Correct Answers Somatic mutations,
meiosis (recombination and independent assortment), sex, and
inter-generational diversification.
What are the three major tasks completed by meiotic
chromosomes? Correct Answers 1. Reduce homologous
chromosome number from two to one (diploid to haploid). 2.
Chromosome recombination (crossing over). 3. Random
assortment of chromosomes.
