Answer:
a, 8
b, 3
Explanation:
If the pedigree you are referring to is the one that is attached then the answer would be:
A pedigree shows how a trait is passed on throughout generations. Like it says in the question, the squares represent males. If the square isn't shaded in, then that means they are unaffected by the trait or normal. If it is shaded, they are affected.
All you need to do for the first question is count the number of squares you see in the whole pedigree. In this case, there are 8.
The second one is asking how many are affected, or have hemophilia. You need to count the number of squares that are shaded in. In the pedigree, we see 3.
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.
If the lower case letter indicates the recessive gene, then there is 0% chance of someone with genotype ee to have a dominant, detached earlobe, appearance
So the following is the answer to you following choices and I hope you are satisfied with my answer.
#2 by making new habitats available to them.
#3 convergent evolution.
#4 a species evolves at a slow, steady pace.
#5 <span> Global temperatures drop several degrees after several massive volcanic eruptions.</span>
