The initial stages of human embryogenesis.
8-cell embryo, at 3 days.
Blastocyst with an inner cell mass and trophoblast.
Trophoblast differentiation.
Histogenesis of the three germ layers.
Artificially colored - gestational sac, yolk sac and embryo (measuring 3 mm at 5 weeks)
Embryo attached to placenta in amniotic cavity.
Stands for the distinct identity of a chemical elemnent
Answer:
Option A , The allele for yellow is dominant to white
Explanation:
It is given that 23 percent of the sheep have white fat and 77 percent have yellow fat.
Thus, it is clear that sheeps with yellow fat is a dominant characteristics.
Usually, the frequency of homozygous recessive allele in a given population is represented by 
and here 
Frequency of allele for white fat 
While frequency of homozygous dominant allele and heterozygous dominant allele is represented by 
And here 
Allele for yellow fat 
Hence, option A is correct.
Answer:
Genes are transferred from parents to offsprings by inheritance. Each offspring receive half of their genes from mother and half from father. But answer of this question is:- Each offspring receive not exactly the same halves of the genes. This different halved of the genes are the reasons we don't.
Explanation:
The only example is with step parents, or others. Half of the parental genes are passed to the child, so a chance for one to look like the uncle or aunt of the family is high. It can also look like any before them, such as a grandmother, father, great grandmother, etc.
