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Chapter 12: Q. 6 (page 326)
Which is one of the seven characteristics that Mendel observed in pea plants?
a. flower size
b. seed texture
c. leaf shape
d. stem color
The correct answer is option b
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Describe one of the reasons why the garden pea was an excellent choice of model system for studying inheritance.
In a mating between two individuals that are heterozygous for a recessive lethal allele that is expressed in utero, what genotypic ratio (homozygous dominant:heterozygous: homozygous recessive) would you expect to observe in the offspring?
a. 1:2:1
b. 3:1:1
c. 1:2:0
d. 0:2:1
The gene for flower position in pea plants exists as axial or terminal alleles. Given that axial is dominant to terminal, list all of the possible F1 and F2 genotypes and phenotypes from a cross involving parents that are homozygous for each trait. Express genotypes with conventional genetic abbreviations.
People with trisomy 21 develop Down鈥檚 syndrome. What law of Mendelian inheritance is violated in this disease? What is the most likely way this occurs?
If black and white true-breeding mice are mated and the result is all gray offspring, what inheritance pattern would this be indicative of?
a. dominance
b. codominance
c. multiple alleles
d. incomplete dominance
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