Explain why, for each pregnancy, human

parents have a 50 percent probability of having

a boy and a 50 percent probability of having a

girl.

Example of a human geneticdisorder caused by an alteration in chromosome structure (not a modification of an allele).

Jimmy does a cannonball into the swimming pool. After surfacing and floating for a few seconds, he observes something interesting. He notices that if he takes deep breaths his body seems to float more.

What is a required input for the light independent reactions?

Jack grows mangoes on his farm. He wants to make sure that the fruit ripens before being transported to other cities. What can he do to ensure that the mangoes ripen?

The ultrastructure of a chloroplast is best studied using a

Games like tag and hide and seek are examples of: A: Constructive play B: Fantasy play C: Creative play D: Motor play E: Parallel play

Explain in a complete sentence why it is important for scientists to share information with one another.

The DNA message depends on the order of the a. nitrogen bases. b. acids. c. sugars. d. genes.

How to tell if a fossil is older

Males have only one copy of each type of sex chromosome; therefore, all sex-linked genes are expressed, even recessive alleles. Based on this information, which statement is true? A.