In poultry, rose comb is controlled by a dominant allele and its recessive allele controls single comb
(a) Give the genotype and phenotype produced from crossing a pure-breeding, rose comb
chicken with a pure-breeding, single comb chicken.
(b) Give the results of the backcross of the F1 hybrid with both pure-breeding parents. What will be an ideal response?
(a) Rr, rose
(b) Rr ? RR ? all rose, Rr ? rr ? 1/2 rose, 1/2 single
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Which researchers showed that DNA is the genetic material?
A) Watson and Crick B) Hershey and Chase C) Garrod and Griffith D) Meselson and Stahl
Human pedigrees do not show the clear patterns that Mendel found in his peas because:
A: there are no dominant traits in humans. B: there are no recessive traits in humans. C: Punnett squares cannot be constructed for humans. D: human meiosis does not result in segregation of alleles into gametes. E: humans do not produce large numbers of offspring.
The basal ganglia consists of a group of neurons located deep to the cerebral cortex. It receives information from both the cerebral cortex and brainstem, and functions to modify ongoing activity in motor pathways (i.e. suppresses unwanted "antagonistic" movement).
a. true b. false
The vaccine for immunity to Haemophilus influenzae serotype b is
What will be an ideal response?