Exam 11: Single-Gene Inheritance and Meiosis Rock for a Cause

Having brown eyes is dominant to having blue eyes.What are all the possible parental combinations that would produce a child with blue eyes? List the parental combinations as [Parent 1 genotype] × [Parent 2 genotype].Use the letters "B" and "b" to designate dominant and recessive alleles,respectively.As an example,note that "BB × bb" is equivalent to "bb × BB"; thus,you only need to list one,not both.

A duplicated homologous chromosome pair contains how many possible alleles?

An organism's _________ determines its __________.

Which parent contributes the chromosome that determines the gender of a child?

Huntington disease is a dominantly inherited disorder.What is the probability that a child will have Huntington disease if the father and the mother are both heterozygous? Use a Punnett square to show your work and use the letters "D" and "d" to designate dominant and recessive alleles,respectively.

Cystic fibrosis is the result of a nonfunctional protein that regulates

Which of the following is TRUE of crossing over?

Draw the Punnett square showing all the possible genotypes of children born to a man with genotype AABb and a woman with genotype AaBb.

A phenotypically normal woman marries a man with CMT disease,an autosomal dominant disorder.They have a son who has CMT disease.How did the son get it?

A friend just gave you a striped corn snake male and a blood red corn snake female.You know that both of these are recessive conditions that are located on different chromosomes.How many generations will it take you to produce striped,blood red corn snakes? What other types of snakes will you produce? Use S = No Stripe,s = stripe,B = no blood red,and b = blood red. Your striped male must be recessive for both alleles for the striped gene and you can assume he is dominant for both alleles for the blood red gene. Your blood red female must be recessive for both alleles for the blood red gene and you can assume she is dominant for both alleles for the striped gene.Show your Punnett squares.

All of the following are true of recessive alleles,EXCEPT

What phenotypic ratio of the progeny results from independent assortment of two traits when parents are heterozygous for both traits?

Which term would represent the trait cystic fibrosis?

Write 1 for meiosis and 2 for mitosis. A. 46→23 __ B. 46→46 __ C. 2n→n __ D. n→n __ E. germ cell→gamete __

If a mutation in DNA caused a 400-amino-acid-long enzyme to only be 200 amino acids long,would this affect the function of the enzyme?

If someone is said to be "heterozygous" for a trait,it means that

When a woman becomes pregnant for the first time,obstetricians sometimes run a blood test to see if the mother carries an allele for cystic fibrosis (CF).If the mother does not carry an allele,the doctor does not bother to test the father,nor does he worry about the baby.Explain the reasoning behind such an approach.

How many chromosomes are in a gamete?

What is the process where maternal and paternal chromosomes exchange genetic material?

Two healthy individuals have a child who has Huntington disease,an autosomal dominant disease.How did this happen?