What must occur during fertilization in humans in order to produce a male child

The Father is Blood Type O, the Mother is Blood type AB What are the percentages of Blood types in the offspring?

At are the first organisms in the primary succession? a. small trees b. small bushes c. lichens d. pine trees

Why is the phloem in a leaf important to the roots of a plant? A. It provides the roots with carbohydrates. B. It provides the roots with nutrients from the soil. C. It transports water to the leaves from the roots. D.

Which statement best describes how genes are able to produce a organism's traits?

What are some limitations of a dichotomous key?

Pairing of homologous chromosomes in prophase of meiosis I appears to be critical for proper alignment, crossing over, and subsequent separation. This pairing is facilitated by the sharing of sequence homology between homologous chromosomes.

What does "leeward" mean?

Which lipid acts as a chemical messenger? a. adipose tissue b. cholesterol c. testosterone d. beeswax

The degradation of alanine yields pyruvate and the degradation of leucine yields acetyl coa. can the degradation of each of these amino acids directly replenish the pool of tca intermediates? explain why or why not.

How does the Arthropod growth curve differ from the growth curve of most other animals?