Based only the sex chromosomes in typical human egg and sperm cells at fertilition, the probability of producing a fmale is

a 25%
b 50%
c 75%
d 90%

Astudent conducts an experiment to determine how the amount of water given to a plant affects it growth what is the dependent variable for this experiment

Which statement best describes the relationship between an allele and a gene? question 1 a. an allele is a variation of a gene that can be expressed as a phenotype. b. an allele is the part of a gene that attaches to messenger rna molecules. c. an allele is a segment of a dna molecule that controls replication of a gene.

Which statement names a physical property of wood? wood does not rustwood can burnwood can rotwood is softer than coal