Complete question:
A female is born with attached earlobes, which is a recessive phenotype. Which of the following statements about her parents must be true?
a. neither has the codominant allele.
b. Her father has an inactivated allele.
c. Both parents have the recessive allele.
d. Her mother carries the dominant allele.
Answer:
c. Both parents have the recessive allele.
Explanation:
A recessive trait is expressed in homozygous recessive genotypes only. If a female expresses the attached earlobe phenotype, she should be homozygous for the allele since the attached earlobe is a recessive trait. If allele "a" gives attached earlobe phenotype in homozygous genotype, the genotype of the female would be "aa". This means that the female has got one copy of the allele "a" from her either parents. Therefore, both her parents should have at least one copy of the recessive allele "a".
Answer:
a. inhibits cAMP phosphodiesterase, the enzyme that converts cAMP to AMP.
Explanation:
The phosphodiesterases are a group of enzymes that are capable of breaking phosphodiester bonds such as those between nucleotides in nucleic acids. The Cyclic adenosine monophosphate (cAMP) is a second messenger involved in intracellular signaling pathways. This molecule (cAMP) is hydrolyzed by the cAMP-dependent phosphodiesterase, which catalyzes the enzymatic breakdown of phosphodiester bonds (i.e., hydrolyzing cAMP to 5-AMP). The cAMP levels are modulated by the balance between its generation and the degradation via cyclic nucleotide phosphodiesterase.
A cause of muscle soreness is when you exercise too much. Another cause is when your tissue reflexes to something biochemical.
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The characteristics or features that an organism has, such as eye color, skin color, hair color, tall or short is called a trait. In order for a trait to show up in the offspring, there should be two alleles present. One coming from the father, and the other from the mother. When fertilization occurs, the new offspring will have two alleles for every trait. The combination one has (coming from the father and from the mother) is called genotype. The two matching alleles is called homozygous while the two different alleles is called heterozygous. The allele that is expressed in heterozygous individuals is the dominant allele, while the allele that is not expressed is the recessive allele. The traits that are expressed make up you phenotype.
