Sperm and egg cells are different because * A. egg cells have an X chromosome
B. sperm cells don't have homologous chromosomes
C. sperm cells have Y chromosomes
D. egg cells have Y chromosomes

Based on anatomical similarities, to which modern animal is dr. digger’s creature most closely related?

How does friction with the atmosphere affect the speed of an artificial satellite

Acertain species of fish can have either long or short fins. the allele for long fins is dominant over the allele for short fins. a heterozygous, long-finned fish is crossed with a homozygous, short-finned fish. of the offspring, will have long fins and be , and will have short fins and be .