Organisms that have a mixed pair of alleles--such as Rr--are said to be
A. homozygous.
B. heterozygous.
C. dominant.
D. recessive.
Pea plants express the __________ for tallness or shortness.
A. genotype
B. phenotype
C. hybrid
D. cross
If R represents the allele for round seeds, and r represents the allele for wrinkled seeds, which of the following represents the genes of a heterozygous round-seeded pea plant?
A. RR
B. Rr
C. rR
D. rr
If we cross a homozygous round-seeded pea plant (RR) with a homozygous wrinkle-seeded pea plant (rr), what are the possible phenotypes?
A. 3/4 round and 1/4 wrinkled
B. 1/2 round and 1/2 wrinkled
C. All round
D. All wrinkled
__________ occurs when alleles for different traits segregate independently from one another and do not influence each other’s inheritance.
A. Anaphase I
B. Independent assortment
C. Cross-pollination
D. Prophase I
Which of the following is heterozygous?
A. RR
B. rr
C. Rr
D. XX
An organism’s genetic composition is known as its
A. karyotype.
B. phenotype.
C. genotype.
D. gene.
The process that separates the two alleles of a gene is called
A. segregation.
B. cross-pollination.
C. crossing-over.
D. genotyping.
The physical expression of the genotype is called:
A. offspring
B. reproduction
C. phenotype
D. none of the above
If tall plant is a dominant trait, and short plant is a recessive trait, which of the following situations can produce short plant offspring?
A. Any parents that are tall plants
B. Both parents are heterozygous tall plants.
C. Both parents are homozygous tall plants.
D. One parent is homozygous tall plant, and the other is heterozygous tall plant.
A. homozygous.
B. heterozygous.
C. dominant.
D. recessive.
Pea plants express the __________ for tallness or shortness.
A. genotype
B. phenotype
C. hybrid
D. cross
If R represents the allele for round seeds, and r represents the allele for wrinkled seeds, which of the following represents the genes of a heterozygous round-seeded pea plant?
A. RR
B. Rr
C. rR
D. rr
If we cross a homozygous round-seeded pea plant (RR) with a homozygous wrinkle-seeded pea plant (rr), what are the possible phenotypes?
A. 3/4 round and 1/4 wrinkled
B. 1/2 round and 1/2 wrinkled
C. All round
D. All wrinkled
__________ occurs when alleles for different traits segregate independently from one another and do not influence each other’s inheritance.
A. Anaphase I
B. Independent assortment
C. Cross-pollination
D. Prophase I
Which of the following is heterozygous?
A. RR
B. rr
C. Rr
D. XX
An organism’s genetic composition is known as its
A. karyotype.
B. phenotype.
C. genotype.
D. gene.
The process that separates the two alleles of a gene is called
A. segregation.
B. cross-pollination.
C. crossing-over.
D. genotyping.
The physical expression of the genotype is called:
A. offspring
B. reproduction
C. phenotype
D. none of the above
If tall plant is a dominant trait, and short plant is a recessive trait, which of the following situations can produce short plant offspring?
A. Any parents that are tall plants
B. Both parents are heterozygous tall plants.
C. Both parents are homozygous tall plants.
D. One parent is homozygous tall plant, and the other is heterozygous tall plant.