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WorksheetsAP Biology Genetics WarmUp
Total questions: 17
Worksheet time: 13mins
If 2n = 48 for a particular cell, then the chromosome number in each cell after meiosis would be
96
48
24
12
The process depicted in the image above is best summarized by which of the following descriptions?
During the synthesis phase of the cell cycle, DNA molecules replicate to generate identical daughter cells
Centromeres align specific gene sequences of homologous chromosomes during mitotic divisions.
The spindle apparatus attaches at chiasma during metaphase of mitosis.
During meiosis, crossing over leads to recombination of alleles between homologous chromosomes
An alternate form of a gene for a specific trait or gene product
genotype
allele
gene
phenotype
The observable characteristics or traits of an organism
genotype
phenotype
dominant
homozygous
The basic unit of heredity that consists of a segment of DNA on a chromosome
chromosome
double helix
homozygous
gene
An organism that inherits two of the same alleles from its parents
dominant
phenotype
heterozygous
homozygous
Which best describes epistasis?
An allele that changes the genotype of another allele
A gene that changes the genotype of another gene
An allele that controls or masks the expression of another allele
A gene that controls or masks the expression of another gene
The disorder caused by nondisjunction of chromosome 21 is known as
Down's syndrome
Turner's syndrome
Klinefelter's syndrome
Triple X syndrome
Chromosomes with genes for traits unrelated to sex are called
autosomes
complete
deutosomes
linked genes
What occurs when a single gene affects more than one trait?
codominant
pleiotropy
polygenic
epistasis
When a trait, such as height in humans, is continuously variable over a wide phenotypic range, it is reasonable to suspect that it is exhibiting:
Epistasis
Variable Expressivity
Polygenic Inheritance
Environmental Interactions
Gene S controls the sharpness of spines in a type of cactus. Cacti with the dominant allele, S, have sharp spines, whereas homozygous recessive ss cacti have dull spines. At the same time, a second gene, N, determines whether cacti have spines. Homozygous recessive nn cacti have no spines at all.
Incomplete Dominance
Epistasis
CoDominance
Pleiotropy
