Fraternal twins, which are nondientical genetically, arise when two oocytes mature, are released, and are fertilized at the same time. Such twins run in families. The incidence varies among ethnic groups and is highest among blacks and lowest in Asians. Variation may be an outcome of differences in gene products that affect the FSH level in blood. Explain how a high FSH level would increase the likelihood of fraternal twins.
2006-11-20
22:08:46
·
2 answers
·
asked by
aerojanie
1
in
Biology