Simon has curly hair. If he is homozygous for the gene that determines curly hair, what is true of his parents? a. They have contributed the same type of allele for this gene. b. One, but not both, of his parents, has contributed an allele for curly hair. c. They must each have a recessive allele for straight hair. d. They have together contributed four dominant alleles for this gene.

What is thought to have caused the mass extinction at the end of the cretaceous period?

What best explains whether bromine (br) or neon (ne) is more likely to form a covalent bond? bromine forms covalent bonds because it has seven valence electrons, but neon has eight valence electrons and already fulfills the octet rule. bromine forms covalent bonds because it has many electron shells, but neon has only two electron shells and is tightly bound to its electrons. neon forms covalent bonds because it can share its valence electrons, but bromine has seven valence electrons and can gain only one more electron. neon forms covalent bonds because it has only two electron shells, but bromine has many electron shells and will lose electrons in order to fulfill the octet rule.

Which hormone is used by both males and female?