Children born with Down syndrome have inherited an extra chromosome, so their diploid number is 47 rather than 46 chromosomes. What is this genetic condition called?
A) trisomy 21
B) triploid
C) haploid 21
D) monoploidy
A
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Hexaploid wheat was produced synthetically by He and co-workers. They mated the diploid species, Aegilops tauschii, and the tetraploid species, T. turgidum. Which of the following is an accurate statement about the relative contribution of each parent
to the genome of the hexaploid offspring? A) Each parent contributed equally to the genome of the offspring. B) Aegilops tauschii contributed four chromosomes by failing to complete meiosis after chromosome replication, and T. turgidum contributed two chromosomes. C) Aegilops tauschii contributed two sets of chromosomes, and T. turgidum contributed four sets of chromosomes. D) The hexaploid number appeared following mitosis with no subsequent cell division.
An individual who avoids light is exhibiting
(a) negative phototaxis. (b) positive geotaxis. (c) negative thigmotaxis. (d) positive thigmotaxis.
The flight of a blimp best illustrates
What will be an ideal response?
The product rule is used to determine the probability that two parents with a Bb genotype will have a child who also
has the Bb genotype. Indicate whether the statement is true or false.