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Grade 8 Module Cells and Heredity Chapter 3 Genetics: The Science of Heredity Flashcards | StudBud
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Grade 8 Module Cells and Heredity Chapter 3 Genetics: The Science of Heredity
Grade 8 Module Cells and Heredity Chapter 3 Genetics: The Science of Heredity
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Grade 8 Module Cells and Heredity Chapter 3 Genetics: The Science of Heredity
Flashcards
20 cards
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Practice quiz
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Questions
20
Answers
1
An organism's phenotype is its allele combinations.
False
True
2
Offspring of chickens (one has black/one has white feathers) have both colors of feathers. Why?
Alleles for feather color are neither dominant/recessive.
Several alleles work together to determine the trait.
Both alleles for feather color are recessive.
Both alleles for feather color are dominant.
3
If a(n) _____ allele is present, its trait will appear in the organism.
recessive
heterozygous
dominant
homozygous
4
What did Gregor Mendel do to study different characteristics in his genetics experiments?
He studied only tall and short pea plants.
He cross-pollinated both plants and animals.
He cross-pollinated plants.
He studied only asexual plants.
5
A pea plant that is heterozygous for tall stems has the alleles
Tt
.
False
True
6
An organism's genotype is its
stem height
genetic makeup
physical appearance
feather color
7
Which term refers to physical characteristics that are studied in genetics?
generations
traits
offspring
hybrids
8
The sex cells produced by meiosis have twice the number of chromosomes as the parent cells.
False
True
9
Which of the following traits is influenced by both inheritance and environmental factors?
dyed hair color
natural hair color
the ability to cough
the ability to sing well
10
When Mendel crossed purebred short plants with purebred tall plants, all offspring were short.
True
False
11
What does a Punnett square show?
only the dominant alleles in a genetic cross
all of Mendel's discoveries about genetic crosses
only the recessive alleles in a genetic cross
all of the possible outcomes of a genetic cross
12
What happens during meiosis?
Two sex cells combine.
Each sex cell copies itself to form four new chromosomes.
Chromosome pairs separate and distribute into new sex cells.
Chromosome pairs remain together when new sex cells form.
13
What is the probability of producing a tall pea plant from two hybrid tall pea plants?
one in four
two in four
three in four
four in four
14
What is the chromosome theory of inheritance?
Genes carry from parents to offspring on chromosomes.
Chromosomes carry from parents to offspring on hybrids
Codominant genes combine to form new hybrids.
Hybrid pairs of chromosomes combine to form offspring.
15
What does the notation
TT
mean to geneticists?
one dominant and one recessive allele
at least one dominant allele
two dominant alleles
heterozygous alleles
16
Alleles that are neither dominant nor recessive produce an inheritance pattern known as _____.
homozygous
heterozygous
dominance
codominance
17
The process in which a parent cell divides twice to produce sex cells is called _____.
prophase
mitosis
anaphase
meiosis
18
A hybrid is the offspring of parents that have different alleles for a trait.
True
False
19
Mendel used principles of ____ to predict what percent of offspring would show a certain trait.
frequency
percents
probability
ratios
20
A(n) _____ organism is the offspring of many generations of organisms that have the same trait.
purebred
offspring
hybrid
crossbred
