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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 meiosis.
B
Allele pairs separate independently of each other during mitosis.
C
The presence of one allele affects the assortment of another.
D
The presence of one trait 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
affected
B
hybrid
C
carrier
D
diseased
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
Parents each donate two gametes, but only one is inherited by the next generation
D
Organisms inherit two copies of each gene, but donate only one copy to each gamete.
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
All petals in the offspring will be smooth.
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 wrinkled.
D
One-half of the petals in the offspring will be smooth, and one-half 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
100%
B
50%
C
25%
D
75%
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
tt
C
TT
D
TH
9) The law of segregation states that
A
different alleles of a gene can never be found in the same organism.
B
alleles of a gene separate from each other during meiosis.
C
each gene of an organism ends up in a different gamete.
D
each gene is found on a different molecule of DNA.
10) The device used to determine the probable outcome of genetic crosses, is called a
A
Punnett Predictor
B
X-Cross
C
Genetic Box
D
Punnett Square
*select an answer for all questions
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