How many sex chromosomes are there in a normal human karyotype?
a. 4
b. you only need one sex chromosome, and that determines if you are a male or female.
c. 2

i'm confused..

Use the drop-down menu to match the following definitions to the corresponding terms. the total variety of organisms that live in the biosphere a group of organisms that breed and produce offspring that can breed all of the biotic and abiotic factors in an area

What are some characteristics of a free enterprise economy?

Aplant with dark red flowers is crossed with a plant with white flowers. all of the offspring have dark red flowers with white spots. the alleles got flower color in this plant are both dominant both recessive codominant incompletely dominant