Suppose polymerase chain reaction (PCR) is used to amplify a single DNA marker on human chromosome 21. Further suppose that a couple who have a child with Down syndrome (trisomy 21) is examined for this marker. The mother has marker alleles of 310 and 380 bp. Her mate has marker alleles of 290 and 340 bp.

PART 1) What PCR bands are present in their child with Down syndrome if nondisjunction occurred in maternal meiosis I?

Select all the possible PCR marker combinations.

A. 290 bp, 310 bp
B. 290 bp, 310 bp, 380 bp
C. 290 bp, 380 bp
D. 310 bp, 340 bp
E. 310 bp, 340 bp, 380 bp
F. 340 bp, 380 bp

PART 2) What PCR bands are present in their child with Down syndrome if nondisjunction occurred in maternal meiosis II?

Select all the possible PCR marker combinations.

A. 290 bp, 310 bp
B. 290 bp, 310 bp, 380 bp
C. 290 bp, 380 bp
D. 310 bp, 340 bp
E. 310 bp, 340 bp, 380 bp
F. 340 bp, 380 bp
PART 3) What PCR bands are present in their child with Down syndrome if nondisjunction occurred in paternal meiosis I?

Select all the possible PCR marker combinations.

A. 290 bp, 310 bp
B. 290 bp, 310 bp, 340 bp
C. 290 bp, 340 bp, 380 bp
D. 290 bp, 380 bp
E. 310 bp, 340 bp
F. 340 bp, 380 bp
What PCR bands are present in their child with Down syndrome if nondisjunction occurred in paternal meiosis II?

Select all the possible PCR marker combinations.

A. 290 bp, 310 bp
B. 290 bp, 310 bp, 340 bp
C. 290 bp, 340 bp, 380 bp
D. 290 bp, 380 bp
E. 310 bp, 340 bp
F. 340 bp, 380 bp

the transfer for conduction is the heat transfering from the liquid to the spoon

the transfer for convection is the heat rising from the liquid to the air

the transfer for radiation is the heat going through the sides of the cup and to the air

at least that is what i would do

an individual’s sex (i.e., whether they are a male or female) is determined by the sex chromosomes. most people have two sex chromosomes, one that is inherited from their mother and one that is inherited from their father. typically, females have two x chromosomes (xx) and males have one x chromosome and one y chromosome (xy). conditions caused by changes (“mutations”) in genes located on the x chromosome are considered x-linked.

x-linked recessive inheritance

most x-linked conditions are recessive. this means that in a person with two x chromosomes (most females), both copies of a gene (i.e., one on each x chromosome) must have a change or mutation whereas in a person with one x chromosome (most males), only one copy of a gene must have a mutation. a female with a mutation in one copy of a gene on the x chromosome is said to be a “carrier” for an x-linked condition. a male with a mutation in a gene on the x chromosome is typically affected with the condition. because females have two copies of the x chromosome and males have only one x chromosome, x-linked recessive diseases are more common among males than females. however, x-linked recessive diseases can occur in both males and females.

for x-linked recessive disorders, an unaffected carrier mother who has a mutation in a gene on the x chromosome can transmit either the x chromosome with this mutation or a “normal” x chromosome to her children. if the father is unaffected, none of her daughters will be affected and all of her daughters will be unaffected—since they will inherit at least one normal x chromosome from their father. however, each daughter will have a 50% chance of being an unaffected carrier like her mother and a 50% chance of both x chromosomes being normal.

me and my friend did 2