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WorksheetsGenetics Unit 5 Review
Total questions: 20
Worksheet time: 20mins
Polydactyly is an inherited disease. The allele for Polydactyly (P) is dominant to the affected allele (p). If a person who is homozygous dominant has children with a person who is homozygous recessive, what percentage of their children will likely have Polydactyly.
The inheritance pattern for the trait of widow's peak is shown in the pedigree. Shaded symbols represent individuals that express the dominant trait.
Based on this pedigree, which individual has the genotype "Aa"?
I-1
II-2
II-4
II-5
In humans, the allele for brown eyes is (B), and the allele for blue eyes is (b).
When two heterozygous parents are crossed, what percentage of the offspring is expected to be heterozygous?
50%
0%
75%
25%
The chart shows the genetic control of feather color in chickens.
Which punnett square represents a cross that would produce a brown offspring?
Angelfish colors follow the non-mendelian inheritance rules of co-dominance. The image shows possible phenotypes and genotypes for angelfish. What would be the expected percentage of a cross between a black angelfish and a silver angelfish?
Silver = 50%
Black lace = 0%
Black lace = 100%
Black lace = 75%
Silver = 25%
Both parents have different (a) and this will possibly cause one sibling to express the dominant trait while another expresses the recessive trait.
What is the phenotype of the hamster's offspring labeled with the X in the dihybrid cross shown?
Brown, dancing
Blonde, not dancing
Blonde, dancing
Brown, not dancing
Widows peak is dominant over a straight hairline. Choose the best explanation as to why the majority of offspring had more straight hairlines then the widow's peak.
One parent provided dominant genes and one parent provided recessive genes
Genes from both parents were dominant
Each parent provided both dominant and recessive genes in equal numbers
Genes from both parents were recessive
In humans, Brown eyes are dominant over blue eyes. If one parent is homozygous for brown eyes (BB) while the other parent is homozygous for blue eyes (hh), what is the probability(%) that the offspring of these parents will have blue eyes?
(a)
Two traits were observed for humans: hair color and hair line. For color, Brown (B) is dominant over blonde (b). For hair line, widows peak (W) is dominant over straight hair line (w). What is the genotype for a heterozygous Brown hair widow's peak offspring?
BBWW
BbWW
WwBb
BbWw
In hamsters the allele for black fur (B) is dominant over the allele for tan fur (b), and the allele for short tail (T) is dominant over the allele for long tails (t). What is the expected phenotypic ratio of the offspring of a BbTt x BbTt cross if these alleles sort independently?
9 black fur/short tail
3 black fur/long tail
3 tan fur/short tail
1 tan fur/long tail
16 black fur/short tail
0 black fur/long tail
0 tan fur/long tail
0 tan fur/short tail
12 black fur/short tail
0 black fur/long tail
0 tan fur/short tail
4 tan fur/long tail
4 black fur/short tail
4 black fur/long tail
4 tan fur/ short tail
4 tan fur/ long tail
In humans, sex-linked trait of color blindness is recessive to non color blindness. Which of the following shows the genotype for someone who is considered to be a carrier for colorblindess?
XCY
XcXc
XCXc
XCXC
In flowers, Purple is dominant to white. If a particular flower is white, it must be -
heterozygous for white
heterozygous for purple
homozygous for purple
homozygous for white
According to the law of independent assortment, the biological selection of a particular allele for a trait to be passed to offspring has nothing to do with the selection of the allele for another trait.
True
False
What is the significance (purpose) of the process shown in the image? HINT: this process re-occurs with the creation of every new gamete
What causes the combination of genes from every organism to be different in every gamete?
DNA Replication
independent assortment
crossing over
Which of the following is the correct definition for meiosis?
asexual reproduction
genetic variation
process of producing gametes
4n
Animal's somatic cells have 2n chromosomes. What happens to the # of chromosomes during meiosis?
it isn't meiosis it is mitosis
increased to 4n
reduced to n
Choose the location on the image where crossing over occurs.
Based on the image, tell me both the genotypic ratio and the phenotypic ratio.
