WorksheetsUnit 4B: Genetics Review
Total questions: 25
Worksheet time: 8mins
What is the genotypic ratio when two heterozygotes breed for a monohybrid trait?
1:1:1:1
1:2:1
1:2:3:4
9:3:3:1
What is the PHENOtypic ratio for when two heterozygotes breed for a monohybrid trait?
1:2:1
1:1:1:1
3:1
9:3:3:1
If one trait is determined by more than one gene, it is called...
pleiotropic inheritance
polygenic inheritance
a dihybrid cross
a monohybrid cross
A female affected with colorblindness (a recessive trait) has a child with an unaffected male. What are the odds that their son has colorblindness?
100%
50%
25%
0%
What is it called when one gene can determine multiple phenotype characteristics?
Polygenic inheritance
Independent assortment
Codominance
Pleiotropy
If you take a karyotype of a mammal and the sex chromosomes are around the same height, you can assume that...
The mammal is a female
The mammal is a male
The male is missing a chromosome
There is not enough information to conclude what the gender is
If two homozygous recessive parents have a child, what are the odds that child will display the recessive trait?
0%
25%
50%
100%
In which phase of meisois does the law of segregation occur?
Metaphase I
Metaphase II
Anaphase I
Anaphase II
Which of the following can interfere with linked genes?
Law of independent assortment
Law of segregation
Crossing over
Telephase and cytokinesis
Why are males more susceptible to sex-linked disorders?
Women are incapable of passing down sex-linked disorders
They received their disorder from their father
Sex-linked disorders only occur on Y chromosomes
They only carry one X chromosome
A specific trait that is more common in nature is called...
a wild-type gene
a recombinant gene
a dominant gene
a recessive gene
In a WwVv x WWvv cross, what are the odds that any offspring will be Wwvv?
4/16
8/16
12/16
16/16
If a male bee only carries one X chromosome with no Y, what are the odds that any of their sons will display the recessive trait is the queen bee is heterozygous for that trait?
25%
50%
75%
100%
Karen's dog has black fur and a long tail. If she wanted to find out her dog's genotype in a testcross, which of the following would produce the best results?
Black fur, short tail
Brown fur, long tail
Brown fur, short tail
Black fur, long tail
Two dogs, one in Chicago and the other in Atlanta, have different amounts of fur despite sharing the same genotype. Why?
The environment can affect genes
It's impossible for them to share a genotype
The parents of the dogs had differing amounts of fur
One of the dogs has a mutated gene
What types of genes are responsible for humans bearing different traits?
Chromosomes
Alleles
Mendellian
Levi's
A man dyes his hair before he has a child. Would this have any effect on the hair color of his child?
No, because hair color is a sex-linked trait
No, because dyeing his hair would have no effect on his genetic makeup
Yes, because his hair color would be passed down to his child
Yes, because dyeing his hair would alter his genetic makeup
What is the term for when two homozygous dominant or homozygous recessive organisms breed and produce identical offspring?
A dihybrid cross
A monohybrid cross
Polygenic inheritance
True-breeding
What is the term for when a trait is determined by an X or Y chromosome?
Sex-linked trait
Linked genes
Crossing over
Law of independent assortment
If a AA x aa cross occurs, what is the phenotypic ratio of the offspring?
1:2:1
1:1:1:1
3:1
9:3:3:1
What does Mendel's law of independent assortment state?
There is no way to predict what chromosome pairs will form
Chromosomes pair with each other with no outside influence
The odds of a specific chromosome pair occuring are completely random
Chromosome pairs are determined during prophase
Who is considered the father of genetics?
Mendel
Hippocrates
Arisotle
Darwin
Two AB parents leave the hospital with a child that has O type blood. Does the baby belong to this father?
No, getting O type blood from AB parents is impossible
Yes, because O type blood is a recessive trait that doesn't have to be demonstrated in the parents
Why do linked genes upset the 9:3:3:1 Mendellian ratio?
Linked genes are less likely to assort together
Linked genes ALWAYS assort together
Linked genes are more likely to assort together
Linked genes NEVER assort together
3 genes are located on a loci. The recombinant frequencies are as follows:
- XZ: 27%
- XY: 13%
- YZ: 14%
Which gene is located in between the others?
X
Y
Z
not enough information to determine
