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WorksheetsGenetics Pretest
Total questions: 30
Worksheet time: 20mins
The scientific study of heredity
genetics
alleles
traits
mutations
sequence/ segment of DNA that determines a trait
gene
allele
chromosome
chromatid
Different forms of a gene
allele
trait
chromsome
characteristic
2 identical alleles for a trait.
homozygous
heterozygous
phenotype
geneotype
2 different alleles for a trait
heterozygous
homozygous
genotype
phenotype
the genetic make up of an individual
heterozygous
homozygous
genotype
phenotype
the physical appearance of a trait
heterozygous
homozygous
genotype
phenotype
the likely hood a particular event will occur
probability
chance
Punnett square
gene
the father of genetics
Mendel
Mendeleev
Darwin
Lamarck
the process that creates gametes (sex cells)
mitosis
meiosis
DNA replication
protein synthesis
end result of meiosis
4 genetically different cells
2 genetically different cells
4 genetically identical cells
2 genetically identical cells
the process by which chromosomes exchange a portion of their genetic material
crossing over
ferritization
allele switching
swapping chromosomes
Why is crossing over important?
it is what creates genetic diversity
it is what makes all of us look different from each other
provides millions of different allele combinations
all are correct
what is a gamete
sex cells
somatic cells
sex chromosomes
none of the options
Which of the following are examples of gametes
sperm and egg
pollen and ovule
x and y chromosome
somatic cells
a cell that contains 2 sets of chromosomes
haploid
diploid
polyploid
a cell that contains 1 set of chromosomes
haploid
diploid
polyploid
What is the purpose of a karyotype?
to show the sex of an individual
to test for different genetic disorders
to map our chromosomes present
all the answers are correct
How many chromosomes do human gametes cells have?
46
23
20
40
in a karyotype which chromosome is the sex determining chromosome?
pair 23
pairs 1-23
the 1st chromosome in each pair
what sex chromosomes do females have?
XX
XY
What sex chromosomes do males have?
XX
XY
Cross two heterozygous tall plants. Genotypic ratio? T=tall, t=short
1:2:1
0:4:0
3:1
1:3
Cross two heterozygous tall plants. Phenotypic ratio? T=tall, t=short
1:2:1
3:1
1:3
2:1:1
Genotype of homozygous tall and heterozygous round (Tall and Round are dominant)
TTRr
TTrr
TtRr
ttRr
What are the potential gametes for the genotype TtDd
TD,Td,tD,td
TD,TD,Td,Td
tt,dd,DD,dd
Incomplete Dom: Cross a pure red and pure white flower (R=red, r=white). Genotypic ratio?
0:4:0
4:0
1:3:1
3:1
Codominance: Cross a speckled with a white chicken (B=black, W=white). Genotypic ratio?
0:2:2
2:2
4:0
2:0:2
Genotype of Heterozygous A blood type
IAi
IAIA
IBIA
What chromosomes affect a sex linked trait?
X
Y
X and Y
none
