Since hemophilia is an X-linked recessive disorder, the probability depends on the X alleles.
So, if father has dominant allele (H), the probability that a <span>female child would suffer from hemophilia (genotype: hh) is 0%, no matter of mother's genotype:
Father Mother
Parents: H x Hh
Daughter: HH or Hh
</span> Father Mother
Parents: H x HH
<span>Daughter: HH
</span>
Father Mother
Parents: H x hh
<span>Daughter: Hh or Hh
</span>
But, if the father has recessive allele, the probability that a <span>female child would suffer from hemophilia (genotype: hh) will depend on mother's genotype.
If mother is dominant homozygous, there will be 0% of possibility:
</span> Father Mother
Parents: h x HH
<span>Daughter: Hh
</span>
If mother is recessive homozygous, the possibility is 100%:
Father Mother
Parents: h x hh
<span>Daughter: hh
</span>
If mother is heterozygous, the possibility is 50%:
Father Mother
Parents: h x Hh
<span>Daughter: Hh or hh</span>
Answer:
Definition. The first metaphase of meisosis I encompasses the alignment of paired chromosomes along the center (metaphase plate) of a cell, ensuring that two complete copies of chromosomes are present in the resulting two daughter cells of meiosis I. Metaphase I follows prophase I and precedes anaphase I.
Explanation:
Genotypic ratio- 1:2:1
Phenotypic ratio- 3 brown: 1 blue
Answer:
The correct answer is D. All of the above
Explanation:
Salt exist worldwide and are commonly found in estuaries. Many animals depend on salt marshes for their survival.
Salt marshes provide critical nurseries for many fishes like winter flounder that comes in marsh water and about 70% of commercially available fish use salt marshes at some point in their life.
Salt marshes are one of the most nutrient-rich ecosystem so it provides a breeding ground for many animal species like fishes, shellfish, crabs, etc. Animals in salt marshes like crabs depend on this ecosystem to get protection from predators. So the right answer is D.
