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General Genetics
Test Description: This review covers several genetics topics.
Instructions: Answer all questions to get your test result.
1) A plant with the genotype AABbcc will have the same phenotype as the plant with the genotype _____.
A
AaBBcc
B
AaBbCc
C
aabbcc
D
AAbbCc
2) When Mendel crossed pure bred purple pea plants with pure bred white pea plants the F1 offspring were
A
purple phenotype becasue their genotype was homozygous.
B
white phenotype becasue their genotype was heterozygous.
C
purple phenotype becasue their genotype was heterozygous.
D
white phenotype becasue their genotype was homozygous.
3) A plant with the genotype AABbcc is __________.
A
heterozygous for two different genes
B
triploid
C
composed of six different alleles
D
homozygous for two different genes
4) What do the letters Tt mean to a geneticist?
A
homozygous alleles
B
heterozygous alleles
C
tall plant
D
two dominant alleles
5) If a person carries two copies of the same allele for a gene the geneticist would describe this person as
A
homozygous
B
heterozygous
C
diploid
D
haploid
6) Which of these crosses would produce only heterozygous offspring?
A
AA x Aa
B
AA x aa
C
Aa x Aa
D
aa x Aa
7) Which of the following matings can produce a child with blood type AB? The letters refer to blood types (phenotypes).
A
A x B
B
B x O
C
A x A
D
A x O
8) Which disorder causes red blood cells to have an unusual shape due to a misfolded protein?
A
achondroplasia
B
sickle-cell disease
C
Huntington's disease
D
hypercholesterolemia
9) The likelihood of two linked genes crossing over together depends upon
A
the character the gene codes for.
B
whether the genes are dominant or recessive.
C
whether the genes are on the X chromosome or not.
D
how far apart they are on the chromosome.
10) Close relatives who mate are more likely to have children with genetic diseases because __________.
A
close relatives are likely to carry the same genetic disorders
B
close relatives are genetically very different
C
most genetic diseases are caused by the dominant allele
D
genetic diseases are extremely rare if both parents are from the same ethnic group
*select an answer for all questions
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