WorksheetsUnit 6- Genetics Review
Total questions: 17
Worksheet time: 24mins
The allele that is expressed when 2 different alleles are present or 2 dominant alleles are present
Genetics
Dominant
recessive
Crossing over
The allele that is only expressed when two copies are present
Genetics
Dominant
crossing over
Recessive
When Mendel crossed plants that were purebred purple-flowered with plants that were purebred white-flowered, the resulting offspring all had purple flowers. When allowed to self-pollinate, the F generation gave rise to white-flowered plants as well as purple. As a result, Mendel determined that individual traits are
inherited as discrete units
dilutes in offspring
merged with successive generations
lost in Pollination process
In Bengal tigers, the allele for an orange cat is dominant to the allele for a white coat. If a homozygous recessive tiger is crossed with a tiger heterozygous for coat color, what is the percentage probability that one of the offspring will be orange?
0%
25%
50%
75%
Which phrase best describes the process of crossing over?
Pairs of homologus chromosomes exchange segments
Pairs of sister chromatids exchange segments
pairs of homologous chromosomes become linked
Pairs of sister chromatids become linked
During what stage of meiosis does crossing over occur?
prophase I of meiosis I
anaphase II of meiosis II
telophase I of meiosis I
metaphase II of meiosis II
A
B
C
D
A gene for a particular trait (ex: T or t)
allele
gene
genotype
phenotype
All of an organism's genetic material
genotype
phenotype
allele
genome
The letter combination that makes up a trait (ex: TT, Tt, tt)
phenotype
allele
trait
genotype
An allele that masks the presence of a recessive allele in the phenotype
recessive allele
heterosygous
homozygous allele
dominant allele
The mating of two organisms
Probabiloity
Punnett Square
Cross
Purebred
A grid system for predicting all possible genotypes resulting from a cross
Cross
Punnett Square
Probability
Allele
A gardener crossed a plant with red flowers with a plant that had white flowers. The offspring plants had pink flowers. What is the most likely genetic reason for these differences in color?
codominance
Polygenic Inheritance
Recessive Pink genes
incomplete dominance
What is the main reason that sex-linked disorders are most often observed in males?
The X chromosome only has genes for genetic disorders.
The Y chromosome cannot have genes that cause genetic disorders.
The Y chromosome cannot mask alleles on the X chromosome
The X chromosome has genes only for sex determination.
In humans colorblindness (b) is an example of a sex-linked recessive trait. In this problem, a male with colorblindness marries a female who is not colorblind but carries the (b) allele. Using a Punnett square, determine the probability that the child will have color blindness.
Brown eyes in humans are dominant to blue eyes. A brown-eyed man, whose mother was blue-eyed, marries a brown-eyed woman whose father had blue eyes.
What is the probability that this couple will have a blue-eyed child? _______
