Two true-breeding pea plants are crossed, one with purple flowers and the other with white. Their offspring are
A. still true-breeding, with the same parental genotypes.
B. homozygous with the recessive phenotype.
C. heterozygous with the dominant phenotype.
D. a mixture of purple and white flowers with varying genotypes.
Answer: C
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The gene (IGF1) that encodes a growth hormone has one allele (IGF1-A) that is found in small dogs but not in dogs that are very large. What does this suggest about body size of small dogs?
A. Body size depends on how much growth hormone is produced during early fetal development. B. Body size depends on whether or not the IGF1-A allele is present, if it is the dog grows very large, if it is not present the dog retains a small size. C. It suggests that small dogs are small because the IGF1-A allele is expressed, perhaps inhibiting the growth of the dog and the release of growth hormone. D. It suggests that small dogs have more growth hormone released during fetal development but none released after the birthing process. E. Body size depends on nutrition, not on genetics.
What happens when coleoptiles are illuminated with directional light from the side instead of from directly overhead?
A. More auxin is produced. B. Less auxin is produced. C. Auxin is transported away from the lighted side. D. Auxin is transported toward the lighted side. E. Auxin receptors are activated.
What is the role of primers in the PCR techniques?
A) To separate strands of double-stranded DNA B) To add free nucleotides to the newly formed DNA molecule C) To allow single strands of DNA to bind together D) To target specific areas of DNA
The maximum number of individuals a habitat can support is called its
A) reproductive potential. B) carrying capacity. C) community size. D) density-dependent factor.