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Mendelian Genetics Test
Test Description: Standard #6
Instructions: Answer all questions to get your test result.
1) What did Mendel state in his law of independent assortment?
A
Allele pairs separate independently of each other during mitosis.
B
Allele pairs separate independently of each other during meiosis.
C
The presence of one trait affects the assortment of another.
D
The presence of one allele affects the assortment of another.
2) Tay-Sachs disease is inherited in an autosomal recessive manner. Which term is used to describe a person who has the gene for Tay-Sachs, but does not have the disease?
A
carrier
B
affected
C
diseased
D
hybrid
3) Which sentence BEST expresses a main idea stated in Mendel's law of segregation?
A
Organisms inherit more traits from the female parent than from the male.
B
Parents each donate four alleles for each gene passed on to the offspring.
C
Organisms inherit two copies of each gene, but donate only one copy to each gamete.
D
Parents each donate two gametes, but only one is inherited by the next generation
4) A heterozygous plant (Ss) is crossed with a plant homozygous dominant (SS) for smooth petals. S is dominant for smooth petals, and s is recessive for wrinkled petals. What will MOST LIKELY be the petal texture of the first generation of offspring?
A
One-half of the petals in the offspring will be smooth, and one-half will be wrinkled.
B
Three-fourths of the petals in the offspring will be smooth, and one-fourth will be wrinkled.
C
All petals in the offspring will be smooth.
D
All petals in the offspring will be wrinkled.
5) Having detached earlobes is a dominant trait, while having attached ear lobes is a recessive trait. If one parent is homozygous dominant and the other is heterozygous, what percentage of the offspring will have detached earlobes?
A
50%
B
75%
C
100%
D
25%
6) Having a widow's peak is the dominant trait (W), while lacking a widow's peak is the recessive trait (w). If 100% of the offspring are heterozygous, what are the genotypes of the parents?
A
ww and Ww
B
WW and ww
C
Ww and WW
D
WW and Ww
7) The genotype of a female pea plant is SSTt. Which combinations of alleles could be present in gametes produced by this plant?
A
ST and St
B
St and sT
C
ST and st
D
St and st
8) Tallness ( T) is dominant to shortness ( t) in pea plants. Which of the following represents a genotype of a pea plant that is heterozygous for tallness?
A
tt
B
TH
C
TT
D
Tt
9) The law of segregation states that
A
each gene is found on a different molecule of DNA.
B
different alleles of a gene can never be found in the same organism.
C
each gene of an organism ends up in a different gamete.
D
alleles of a gene separate from each other during meiosis.
10) The device used to determine the probable outcome of genetic crosses, is called a
A
Genetic Box
B
Punnett Square
C
Punnett Predictor
D
X-Cross
*select an answer for all questions
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