Can two parents with albinism have an unaffected child? Explain.

When a couple requests a test for cystic fibrosis, what types of questions might the physician ask before ordering the tests?

Two albinos marry and have four normal children. How is this possible?

A homozygous recessive allele, aa, is responsible for albinism. Humans can exhibit this phenotype. In each of the following cases, determine the possible genotypes of the mother and father, and of their children: (a) Both parents have normal phenotypes; some of their children are albino and others are unaffected: (b) Both parents are albino and have only albino children: (c) The woman is unaffected, the man is albino, and they have one albino child and three unaffected children:

A recessive allele, a, is responsible for albinism, an inability to produce or deposit melanin in tissues. Humans and a variety of other animals can exhibit this phenotype. In each of the following cases, determine the possible genotypes of the mother and father, and of their children: (a) Both parents have normal phenotypes, some of their children are albino and others are unaffected: _____ (b) Both parents are albino and have only albino children: _____ (c) The woman is unaffected, the man is albino, and they have one albino child and three unaffected children: _____

Phenylketonuria (PKU) is a recessive genetic disorder. If both parents are carriers, what is the probability of this couple having a child with PKU? What is the chance of this couple having two children with PKU?

If two parents with dominant phenotypes produce an offspring with a recessive phenotype, then (a) both parents are heterozygous (b) one parent is heterozygous $(c)$ both parents are homozygous (d) one parent is homozygous.

Why do you think the male reproductive system produces so many sperm cells?

Find

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Write a letter to someone who has a sweet tooth. Persuade him or her that fruit is an easy, healthful, and convenient substitute for candy or cookies.

The gene for albinism in humans is recessive. That is, carriers of this gene have probability 1/2 of passing it to a child, and the child is albino only if both parents pass the albinism gene. Parents pass their genes independently of each other. If both parents carry the albinism gene, what is the probability that their first child is albino? If they have two children (who inherit independently of each other), what is the probability that both are albino? That neither is albino?

Keep an activity log for 1 day. Write down everything you do in a day and the length of time you do each activity. Identify wasted time, and see if you can fit in exercise time and more sleep time.

The following pedigree shows the inheritance of a completely penetrant, dominant trait called amelogenesis imperfecta that affects the structure and integrity of the teeth. DNA analysis of blood obtained from affected individuals III-1 and III-2 shows the presence of the same disease-causing mutation in one of the two copies of an autosomal gene called ENAM that is not seen in DNA from the blood of any of the parents in generation II. Explain this result, citing Fig. Do you think this type of inheritance pattern is rare or common?

Cookies have a varied history. Some have interesting origination stories. Research one type of cookie. Determine where the cookie originated from and how it was originally created. Write a report on your chosen cookie.