WorksheetsIntro to Genetics
Total questions: 23
Worksheet time: 17mins
A plant with 2 dominant OR 2 recessive alleles is said to be
heterozygous
cross-pollinating
homozygous
true-breeding
Why do sex-linked disorders occur more often in males?
males have 2 X chromosomes
males have only ONE X chromosome
males have 2 Y chromosomes
males have 2 X and 2 Y chromosomes
The one thing that Mendel realized could explain the results of his experiments was that
the traits were appearing at random
the male traits were always the dominant ones
each trait has 2 sets of instructions, one from each parent
his important research would open the door to modern genetics
What carries the genes that determine sex?
homologous chromosomes
pedigree
sex chromosomes
phenotype
Instructions for an inherited trait are called
alleles
phenotype
albinism
genes
What is heredity?
traits passing from offspring to parents
traits passing from parents to offspring
plants that are cross-pollinated
the ratio of dominant to recessive traits
What is a phenotype?
the way an organism feels
a groups of 5 alleles
a dominant gene
the way an organism looks
What is this table called?
P-grid
dominance chart
heredity map
Punnett square
A=purple, a=white What color will one out of every four of the offspring be?
purple
white
purple with white edges
lavender (white & purple mix)
A=purple, a=white What is the probability that the offspring will be aa?
25%
50%
75%
100%
Kia crosses a plant that has 2 recessive alleles for white flowers w/a plant that has 2 dominant alleles for purple alleles. Which result would be true of all of the offspring?
all of the offspring would have 2 recessive alleles & white flowers
all of the offspring would have 2 dominant alleles & purple flowers
all of the offspring would have 1 recessive allele, 1 dominant allele, & white flowers
all of the offspring would have 1 recessive allele, 1 dominant allele, & purple flowers
Which of these choices is an example of what Mendel described as a dominant trait?
a trait that is seen in every offspring
a trait that is due to environmental influence
a trait that is present only when an offspring inherits 2 dominant "factors" (alleles)
a trait that is present when an offspring inherits at least one dominant "factor" (allele)
Mendel saw that 2 plants w/purple flowers could produce some offspring w/white flowers & some offspring w/purple flowers. Which of the following did he use to explain this result?
genetic mutations
environmental conditions
inherited and acquired traits
dominant and recessive traits
Which of these choices is the definition of allele?
the form of a gene that is expressed
one of the alternative forms of a gene
the combination of genes for a specific trait
the complete genetic makeup of a living thing
One bunny's genotype is BB for brown fur. A second bunny's genotype is bb for white fur. Which statement is true about the alleles B and b?
they are two different genes
they result in the same phenotype
they are two different versions of the same gene
they provide identical instructions about different traits
A snapdragon plant w/red flowers is crossed w/a snapdragon plant w/white flowers. The offspring produced have pink flowers. Which of these conditions does this illustrate?
codominance
nondomincae
complete dominance
incomplete dominance
Human blood types A & B are co-dominance. What kind of blood cells are produced by a person that has inherited an A allele & a B allele blood?
type A
type B
both type A and type B
neither type A nor type B
Which of these is an inherited trait?
short hair
a small scar
pierced ears
cheek dimple
Which of the following choices gives the alleles of the parents shown here?
AA and AA
Aa and Aa
aa and aa
AA and Aa
Which of these choices gives the correct ratio for the offspring predicted by the diagram?
2 TT : 1 Tt
1 TT : 1 TT
1 TT : 1 Tt
1 TT : 2 Tt
Which of these choices BEST describes probabilty?
a comparison that shows the relationship between quantities
the most likely outcome of a given cross
how likely a given outcome will happen compared to all possible outcomes
a way to calculate exactly which alleles an offspring will inherit from its parents
Which of the following best describes a sex-linked gene?
a gene that is only found in males
a gene that is only found in females
a gen that is located on a sex chromosome
a gene that causes a sexually transmitted disease
Which of the following is true of a man who is colored blind?
he inherited 2 alleles for color blindness from his father
he inherited 1 allele for color blindness from his mother
he will pass on the allele for color blindness to all of his children
he has 1 allele for color blindness & another allele for normal vision
