CSS - PMS - CCE - PCS - Everyday Science
Cell BiologyDNA and Genetics
In a test cross Aa × aa (practice 52), what proportion is expected to show the recessive phenotype?
A. 3/4
B. 1/2
C. 1/4
D. 0
Correct Answer: B
Half the offspring are expected to be aa.
CSS - PMS - CCE - PCS - Everyday Science
Cell BiologyDNA and Genetics
In a monohybrid cross Aa × Aa (practice 51), what fraction is expected to be homozygous recessive?
A. 1/2
B. 3/4
C. 1
D. 1/4
Correct Answer: D
Aa × Aa gives 1 AA : 2 Aa : 1 aa.
CSS - PMS - CCE - PCS - Everyday Science
Cell BiologyDNA and Genetics
For a heterozygous individual Aa (practice 50), what is the probability a gamete carries allele a?
A. 3/4
B. 1
C. 1/4
D. 1/2
Correct Answer: D
Alleles segregate equally.
CSS - PMS - CCE - PCS - Everyday Science
Cell BiologyDNA and Genetics
In a test cross Aa × aa (practice 49), what proportion is expected to show the recessive phenotype?
A. 0
B. 1/2
C. 1/4
D. 3/4
Correct Answer: B
Half the offspring are expected to be aa.
CSS - PMS - CCE - PCS - Everyday Science
Cell BiologyDNA and Genetics
In a monohybrid cross Aa × Aa (practice 48), what fraction is expected to be homozygous recessive?
A. 1/4
B. 3/4
C. 1
D. 1/2
Correct Answer: A
Aa × Aa gives 1 AA : 2 Aa : 1 aa.
CSS - PMS - CCE - PCS - Everyday Science
Cell BiologyDNA and Genetics
For a heterozygous individual Aa (practice 47), what is the probability a gamete carries allele a?
A. 1
B. 1/2
C. 1/4
D. 3/4
Correct Answer: B
Alleles segregate equally.
CSS - PMS - CCE - PCS - Everyday Science
Cell BiologyDNA and Genetics
In a test cross Aa × aa (practice 46), what proportion is expected to show the recessive phenotype?
A. 1/2
B. 3/4
C. 0
D. 1/4
Correct Answer: A
Half the offspring are expected to be aa.
CSS - PMS - CCE - PCS - Everyday Science
Cell BiologyDNA and Genetics
In a monohybrid cross Aa × Aa (practice 45), what fraction is expected to be homozygous recessive?
A. 1/2
B. 1
C. 1/4
D. 3/4
Correct Answer: C
Aa × Aa gives 1 AA : 2 Aa : 1 aa.
CSS - PMS - CCE - PCS - Everyday Science
Cell BiologyDNA and Genetics
For a heterozygous individual Aa (practice 44), what is the probability a gamete carries allele a?
A. 3/4
B. 1
C. 1/4
D. 1/2
Correct Answer: D
Alleles segregate equally.
CSS - PMS - CCE - PCS - Everyday Science
Cell BiologyDNA and Genetics
In a test cross Aa × aa (practice 43), what proportion is expected to show the recessive phenotype?
A. 0
B. 3/4
C. 1/2
D. 1/4
Correct Answer: C
Half the offspring are expected to be aa.
CSS - PMS - CCE - PCS - Everyday Science
Cell BiologyDNA and Genetics
In a monohybrid cross Aa × Aa (practice 42), what fraction is expected to be homozygous recessive?
A. 1/2
B. 3/4
C. 1
D. 1/4
Correct Answer: D
Aa × Aa gives 1 AA : 2 Aa : 1 aa.
CSS - PMS - CCE - PCS - Everyday Science
Cell BiologyDNA and Genetics
For a heterozygous individual Aa (practice 41), what is the probability a gamete carries allele a?
A. 1/4
B. 1
C. 1/2
D. 3/4
Correct Answer: C
Alleles segregate equally.
CSS - PMS - CCE - PCS - Everyday Science
Cell BiologyDNA and Genetics
In a test cross Aa × aa (practice 40), what proportion is expected to show the recessive phenotype?
A. 1/4
B. 0
C. 1/2
D. 3/4
Correct Answer: C
Half the offspring are expected to be aa.
CSS - PMS - CCE - PCS - Everyday Science
Cell BiologyDNA and Genetics
In a monohybrid cross Aa × Aa (practice 39), what fraction is expected to be homozygous recessive?
A. 3/4
B. 1
C. 1/2
D. 1/4
Correct Answer: D
Aa × Aa gives 1 AA : 2 Aa : 1 aa.
CSS - PMS - CCE - PCS - Everyday Science
Cell BiologyDNA and Genetics
For a heterozygous individual Aa (practice 38), what is the probability a gamete carries allele a?
A. 1/2
B. 1/4
C. 3/4
D. 1
Correct Answer: A
Alleles segregate equally.
CSS - PMS - CCE - PCS - Everyday Science
Cell BiologyDNA and Genetics
In a test cross Aa × aa (practice 37), what proportion is expected to show the recessive phenotype?
A. 1/4
B. 0
C. 1/2
D. 3/4
Correct Answer: C
Half the offspring are expected to be aa.
CSS - PMS - CCE - PCS - Everyday Science
Cell BiologyDNA and Genetics
In a monohybrid cross Aa × Aa (practice 36), what fraction is expected to be homozygous recessive?
A. 1
B. 1/4
C. 3/4
D. 1/2
Correct Answer: B
Aa × Aa gives 1 AA : 2 Aa : 1 aa.
CSS - PMS - CCE - PCS - Everyday Science
Cell BiologyDNA and Genetics
For a heterozygous individual Aa (practice 35), what is the probability a gamete carries allele a?
A. 3/4
B. 1/2
C. 1/4
D. 1
Correct Answer: B
Alleles segregate equally.
CSS - PMS - CCE - PCS - Everyday Science
Cell BiologyDNA and Genetics
In a test cross Aa × aa (practice 34), what proportion is expected to show the recessive phenotype?
A. 1/2
B. 1/4
C. 0
D. 3/4
Correct Answer: A
Half the offspring are expected to be aa.
CSS - PMS - CCE - PCS - Everyday Science
Cell BiologyDNA and Genetics
In a monohybrid cross Aa × Aa (practice 33), what fraction is expected to be homozygous recessive?
A. 1/2
B. 1
C. 1/4
D. 3/4
Correct Answer: C
Aa × Aa gives 1 AA : 2 Aa : 1 aa.