WorksheetsMid-Unit Genetics Review
Total questions: 53
Worksheet time: 53mins
Homozygous or Heterozygous: Ff
Homozygous
Heterozygous
Homozygous or Heterozygous: ff
Homozygous
Heterozygous
Genotype or Phenotype: Freckles
Genotype
Phenotype
Scientists like to study identical twins in genetics because..
They are identical in every single way so scientists like to find out why.
They have the same talents and that must therefore be part of their DNA.
They have almost exactly the same DNA and this helps scientists figure out what traits come from the environment or from DNA
Their environment always stays the same so they are useful to find out what diseases people can get.
How many Chromosomes do we inherit from our parents?
23 from dad and 23 from mom, or 46 total
13 from dad and 13 from mom, or 26 total
13 from dad and 33 from mom, or 46 total
What is a gene?
An entire chromosome.
A small part of DNA found in a chromosome that gives our body instructions to build for a specific trait that we have
Things that are sometimes refered to as XX and XY inside of our cell membranes
Kind of like a "flavor" because there are 23 kinds from each parent.
The chemicals found in DNA are referred to as bases that are represented by the letters
QRTP
ABCD
DTPG
ACTG
What is a Chromosome?
a threadlike structure found in the nucleus of most living cells, carrying genetic information in the form of genes.
An X shaped thing found in the mitochondria of the cell that helps create energy in the form of ATP.
A threadlike structure found in the lysosome carrying genetic information in the form of proteins.
A colorful and fluorescent type of sugar that our body uses to break down and get energy.4
What makes one persons DNA different from someone elses?
The amount of pairs of bases on the strand of DNA.
The order of the bases of ATCG
The amount of mutations found in the DNA
The type of chemicals it's made out of.
What is a trait?
A physical characteristic passed down from your mom
A behavioral characteristic passed down from your dad
A physical or behavioral characteristic passed down from your parents
A behavioral characteristic passed down by your mom
What is an allele?
A trait
Different forms of a gene
DNA
Different types of parents
What is a genotype?
Pair of alleles that determine a specific trait
Observable physical trait
A trait that is observed with only one copy of an allele
What is a phenotype?
Pair of alleles that determine a trait
Observable physical trait
Different forms of a gene
What is a dominant gene?
A trait that is observed when there are one OR two copies of the allele
A trait that is observed only when there are two copies of the allele
A trait that can be hidden in a generation
A person who is homozygous for a trait can have a genotype of....
AA, Aa
Aa, aa
AA, aa
aa
If a person is heterozygous for a trait, their genotype can be...
Aa
AA, aa
AA, Aa
AA
If "B" represents brown hair, and "b" represents blond hair, what will the genotype be for a homozygous brown haired person?
BB
Bb
bb
If "B" is brown and "b" is blond, what is the phenotype of someone who's genotype is "bb"
Brown Hair
Blond Hair
Red Hair
Heterozygous: Different, Homozygous:_____________
The same
Less Than
Greater Than
4 copies
How many copies of the recessive gene must there be for that phenotype to show up?
1
2
3
4
What is the missing pairing?
AA
Aa
aa
Using the Punnett Square, identify the correct Genotypic ratio
2:2:1
1:2:1
2:1:1
1:1:1
Based on the missing letter, what is the parent's genotype?
AA
Aa
aa
The instruction of one allele covers up the instruction
of the other allele in a homologous pair. Symbolized by a capital letter.
Recessive Allele
Dominant Allele
Heredity
Trait
A genotype where one dominant and one recessive allele was passed on from both parents for one trait.
Bb Aa Tt Ll
Allele
Homozygous Dominant
Homozygous Recessive
Heterozygous
The observable traits dictated by the genotype
Phenotype
Genotype
Homozygous Recessive
Homozygous Dominant
During meiosis and gamete formation, homologous (paired up) alleles split up
Phenotype
Law of Segregation
Genotype
Dihybrid Cross
During meiosis, the homologous pairs of chromosomes and the matching alleles are lined up independently.
Offspring are a mix of maternal genes and paternal genes.
This increases genetic variation.
Homozygous Dominant
Law of Segregation
Crossing Over
Independent Assortment
The Italian monk/scientist who first showed
the principles of genetics
Watson and Crick
Linnaeus
Darwin
Mendel
Passing on traits from parents to offspring
Chromosome
Genotype
Heredity
Allele
A genotype where only recessive alleles
were passed on from both parents for one trait
bb aa tt ll
Heredity
Homozygous Dominant
Homozygous Recessive
Phenotype
In cattle red coats are represented as RR, and white coats are represented as WW.
What is the genotype for Roan color?
RR
RW
WW
A woman with curly hair and a man with straight hair produced a child with wavy hair:
Incomplete dominance
Codominance
Complete dominance
When more than two versions of a gene for a particular trait exist in the human population, it is a ____________________ trait.
sex-linked
polygenic
epistatic
multiple allele
When two alleles are expressed equally in a heterozygous individual and their phenotype is a blend or mix of the homozygous phenotypes
polygenic
incomplete dominance
codominance
pleiotropy
