Pls asap 20 ! hemophilia is a genetic blood disorder. the female parent must carry one copy of the gene for the child to inherit hemophilia. also, males have a greater probability of getting hemophilia than females. which type of trait is hemophilia? a sex-linked recessive b multiple allele c environmental d dominant

Sex-linked recessive.

Explanation:

Hemophilia is genetic disease caused by the mutation in different genes. The small cut in case of hemophilia leads to the excessive bleeding of an individual.

The genes responsible for hemophilia is present on the X chromosome. The males with a single affected X chromosome show 100% chances to be suffered from the hemophilia. Females with a single copy of affected X gene is considered as a carrier of the disease and pass down the disease to their sons. Thus, hemophilia is considered as sex-linked recessive trait.

Thus, the correct answer is option (A).  

fertilization, pictured in figure 24.23a is the process in which gametes (an egg and sperm) fuse to form a zygote. the egg and sperm each contain one set of chromosomes. to ensure that the offspring has only one complete diploid set of chromosomes, only one sperm must fuse with one egg. in mammals, the egg is protected by a layer of extracellular matrix consisting mainly of glycoproteins called the zona pellucida. when a sperm binds to the zona pellucida, a series of biochemical events, called the acrosomal reactions, take place. in placental mammals, the acrosome contains digestive enzymes that initiate the degradation of the glycoprotein matrix protecting the egg and allowing the sperm plasma membrane to fuse with the egg plasma membrane, as illustrated in figure 24.23b. the fusion of these two membranes creates an opening through which the sperm nucleus is transferred into the ovum. the nuclear membranes of the egg and sperm break down and the two haploid genomes condense to form a diploid genome.

explanation:

cell regulation is conducted by special proteins.