Hyla versicolor and h. chrysoscelis are frogs which are morphologically indistinguishable, non-hybridizing and broadly sympatric in central texas. there is no evidence that these species utilize different natural resources and both reproduce throughout the spring and summer. mating involves males clutching the females but fertilization is external. these species are easily distinguished by their mating calls; males and females of h. versicolor are "slow trilling" whereas males and females of h. chrysoscelis are "fast-trilling." the factor that most likely maintains these forms as species is

reproductive isolation

Explanation: reproductive isolation is a factor that affects the speciation process. It is specially important in sympatric populations because blocks genetic flow within them due to physical, seasonal or behavioral differences.

In this particular case, there is a behavioral difference that allow individuals from a specie recognize each other through sound so they can reproduce and do not mix with other species.

on the planet jupiter, the acceleration due to gravity is approximately 26 m s2 , roughly 2.7 times the acceleration due

an individual’s sex (i.e., whether they are a male or female) is determined by the sex chromosomes. most people have two sex chromosomes, one that is inherited from their mother and one that is inherited from their father. typically, females have two x chromosomes (xx) and males have one x chromosome and one y chromosome (xy). conditions caused by changes (“mutations”) in genes located on the x chromosome are considered x-linked.

x-linked recessive inheritance

most x-linked conditions are recessive. this means that in a person with two x chromosomes (most females), both copies of a gene (i.e., one on each x chromosome) must have a change or mutation whereas in a person with one x chromosome (most males), only one copy of a gene must have a mutation. a female with a mutation in one copy of a gene on the x chromosome is said to be a “carrier” for an x-linked condition. a male with a mutation in a gene on the x chromosome is typically affected with the condition. because females have two copies of the x chromosome and males have only one x chromosome, x-linked recessive diseases are more common among males than females. however, x-linked recessive diseases can occur in both males and females.

for x-linked recessive disorders, an unaffected carrier mother who has a mutation in a gene on the x chromosome can transmit either the x chromosome with this mutation or a “normal” x chromosome to her children. if the father is unaffected, none of her daughters will be affected and all of her daughters will be unaffected—since they will inherit at least one normal x chromosome from their father. however, each daughter will have a 50% chance of being an unaffected carrier like her mother and a 50% chance of both x chromosomes being normal.