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WorksheetsPredicting Genetic Outcomes
Total questions: 22
Worksheet time: 21mins
An allele that masks or overshadows the expression of another allele.
(a)
Term that refers to sex cells – the egg and sperm cells.
(a)
Tt
Heterozygous
FF
Homozygous Dominant
gg
Homozygous Recessive
Genotype
Genetic makeup of an organism
Phenotype
Physical appearance of an organism
A small segment of DNA that controls the expression of a hereditary trait.
Gene
Gamete
Genotype
Gene Pool
Allele
Alleles
Two different forms of a gene
Always dominant
Received from mother only
All the DNA in an organism
In a genetic cross a dominant allele is represented by a (a) , while a recessive allele is represented by a (b) . (c) studied the predictable patterns of offspring in pea plants to establish the first laws and principles of (d) .
Mendel considered those traits that were hidden in the first generation to be:
heterozygous
recessive
incompletely dominant
incapable of breeding true
incapable of being inherited
In humans, dimples (D) are dominant over no dimples (d). Curly hair (A) is dominant over straight hair (a). Paul, who is heterozygous for dimples and curly hair, marries Jane, who has curly hair but does not have dimples. Jane's mother had straight hair, but her father had curly hair. Paul and Jane had a child named Peter, who had curly hair but did not have dimples.
Jane's genotype is (a) .
Paul's genotype is (b)
What fraction of Paul and Jane's children should have curly hair and dimples? (c)
What fraction of their children would have straight hair and no dimples? (d)
Heterozygous
AA or aa
Specific types of horses will display both red and brown hair if they are the offspring of one parent with red hair and one parent with brown hair. What is this type of inheritance?
Dominance
Recessive
Incomplete dominance
Codominance
The following genotypes were found in a male cat and a female cat:
BbFf (male) x bbFF (female)
B=Black, b=white
F=short, f=long
Which of the following choices is true
of the phenotype of the offspring from these parents?
All offspring will have black fur.
All offspring will have white fur.
All offspring will have short-hair fur.
All offspring will have long-haired fur.
Hemophilia is a recessive X-linked condition. Which of the following would represent the genotype for a female carrier of hemophilia?
XHXH
XHXh
XHY
XhY
XhXh
If a characteristic is sex-linked it...
will occur more often in males.
will occur more often in females.
never show up at all in females.
will always show up in males.
will always be fatal to the offspring.
A chicken farmer crossed a white hen with a black rooster. The phenotype of the offspring resulted in a third phenotype that was a blend or mix of the phenotypes of the parents. What type of inheritance did the chickens exhibit?
incomplete dominance
polygenic inheritance
codominance
multiple alleles
When the nursery at the hospital caught on fire, everybody rushed out with a baby. After the fire was put out the babies were returned to the nursery, but which baby belonged to which parents? Fortunately the hospital could type all the babies' blood. Match each baby with the correct parents.
Baby # 1
Type O blood
Mr. and Mrs. Jones:
Both had Type A blood
Baby # 2
Type B blood
Mr. and Mrs. Williams
Type AB
and Type O
Baby # 3
Type AB blood
Mr. and Mrs. Wilson
Type B blood
Type A blood
A genetic cross involving two unlinked genes is represented:
AaGG x aaGg
Which genotype is NOT possible in the offspring produced by the cross?
AaGG
Aagg
aaGg
aaGG
Colorblindness is the result of a recessive gene found on the X chromosome. Draw a Punnett Square to show a cross between a mother who is a carrier of colorblindness with a father who has colorblindness.
What percentage of the MALE offspring are expected to be colorblind?
100%
50%
0%
25%
In some chickens, the gene for feather color is controlled by codominance. The allele for black is B and the allele for white is W. The heterozygous phenotype is known as erminette.
What is the genotype for erminette chickens?
Erminette
BB
BW
WW
Based on the Punnett square showing the cross between two erminette chickens, Match the following
Probability offspring will be black
25% BB
Probability offspring will be Erminette
50%
Probability offspring will be white
25% WW
