answer

watching

views

22 Sep 2018

Q1. Peter's blood type is A+ & Rita's blood type is B-. Peter's parents are blood types O- and A+, while Rita's parents are B+ and A+.

a) what are peter's parent's genotypes with respect to the ABO blood type locus and Rh factor?

b) what are rita's parent's genotypes with respect to the ABO blood type locus and Rh factor?

c) what proportion of peter's & rita's offspring would be Rh-positive?

d) what proportion of peter's & rita's offspring would be type-O?

Q2. A haploid cell in G1, has 3pg of DNA in its nucleus. It is n=6.

a) how many pg of DNA are in one of its diploid somatic cells in G1?

b) which stage does DNA replication take place?

c) state how many copies of the genome are present in the following cells...

- diploid cell in G2 - haploid cell in G2 - diploid cell in G1 - one of the daughter cells just following cytokinesis of a diploid cell undergoing mitosis

answer

watching

268

views

For unlimited access to Homework Help, a Homework+ subscription is required.

You have 0 free answers left.
Get unlimited access to 3.8 million step-by-step answers.

Get unlimited access

Already have an account? Log in

Bunny GreenfelderLv2

23 Sep 2018

Unlock all answers

Get 1 free homework help answer.

Already have an account? Log in

Related questions

M2A1 Worksheet: Mitosis and Meiosis

A dog is a diploid organisms and has 39 pairs of chromosomes (2n = 78), where n = 39 chromosomes from each parent. Use this example to answer the following question regarding chromosomal number.

INTERPHASE

How many chromosomes are present in the somatic cell?

What do they look like?

What are they âdoingâ in G1 of this phase?

What is happening in the S phase?

What is happening in the G2 phase?

What follows G2 phase in a somatic cell?

What follows G2 phase in a gamete cell?

MITOSIS

Number of chromosomes in the parent cell.

Number of chromatids in the parent cell.

Number of chromosomes in the daughter cell.

Number of chromatids in the daughter cell.

How many daughter cells are produced?

Are the daughter cells haploid or diploid?

How many cell divisions take place?

In what type of cell does this division occur?

Meiosis 1:

Number of chromosomes in the parent cell.

Number of chromatids in the parent cell.

Number of chromosomes in each Meiosis I daughter cell.

Number of chromatids in each Meiosis I daughter cell.

Are the daughter cells haploid or diploid at the end of Meiosis 1?

Meiosis II:

Number of chromosomes in the âparentâ cell (which is a daughter cell from Meiosis I).

Number of chromatids in the âparentâ cell.

Number of chromosomes in each Meiosis II daughter cell.

Number of chromatids in each Meiosis II daughter cell.

Are the daughter cells haploid or diploid at the end of Meiosis II?

Which phase or phases of Meiosis account for the genetic variability among the daughter cells? Howâ¦ what happens in this phase to create the diversity?

Comparing Mitosis and Meiosisâ¦..

How many daughter cells result from Mitosis? Are they diploid or haploid?

How many daughter cells result from Meiosis? Are they diploid or Haploid?

Cell structures and function: Match each organelle to its function:

Organelle Function

Lysosome 1. Lipid synthesis

Rough ER 2. Houses DNA

Nucleus 3. Energy extraction

Smooth ER 4. Dismantles debris

Golgi apparatus 5. detoxification

Mitochondria 6. Protein synthesis

Peroxisome 7. Processes secretions

What is the function of checkpoint proteins in the cell cycle?

How can all of a personâs cells contain exactly the same genetic material, yet specialize as bone cells, nerve cells, muscle cells and connective tissues?

What are the 3 primary germ layers?

Briefly, in one or two sentences, distinguish between

a bacterial cell and a eukaryotic cell

interphase and mitosis

mitosis and apoptosis

an autosome and a sex chromosome

homologous pair of chromosomes and a sister chromatid

centromere and centriole

chromosome and chromatid

monozygotic and dizygotic twins

allele and gene

The A antigen (the protein that makes A blood A blood) is embedded in the red blood cell (RBC) membrane. Blood group A individuals will automatically carry antibodies (proteins that are in the blood plasma-liquid part of blood) that will attack blood group B cells. Blood group B individuals will carry antibodies that will attack blood group A cells. Blood group O individuals, lacking either of the A or B antigens will carry BOTH types of antibodies and will attack either A or B cells. When there is a transfusion with incompatible blood groups, cells can clump creating blockages in arteries throughout the body. Other pathways can lead to the lysing of RBCâs which will release their contents into the bloodstream elevating these component in the blood which can have sever effects on the heart (potassium primarily-in case you are interested).

Remember, the Rh is a typical one gene, two allele scenario. Rh+ blood can accept Rh+ or Rh- blood. A person with Rh- blood can only receive Rh- blood. Unlike ABO where an individual manufactures the antibody to an antigen they lack without prior exposure, the Rh factor requires previous exposure to illicit an immune response. If a Rh- person is exposed to Rh+ blood, the individual will create the antibody against the Rh antigen. Now, if Rh+ blood is introduced into this individual again, the recipientâs blood contains anti-Rh antibodies and will attack the Rh+ cells-Bad news for the recipient. This is the same thing that happens with an Rh- mom who gets pregnant with an Rh+ baby. By the time the first Rh+ baby is born and blood mixing may have occurred during late pregnancy (small breaks in the placenta can cause some of babyâs blood to mix with that of mom), first baby escapes unharmed. Subsequent babies arenât so lucky.

If there are small tears in the placenta (which are normal), momâs anti Rh antibodies can go in and attack the Rh+ babyâs blood. This can kill the baby. Now, Rh- moms are given a substance that will coat the babyâs RBCâ; kind of like putting them into stealth mode so they canât be seen by momâs immune system. Later-poof, out pops unaffected baby.

1. What blood type(s) can be given to an A positive individual?

2. If you have B negative blood, what blood types can you receive?

3. What blood types can an O negative receive? O positive?

4. If a man is blood group B and his wife is blood group A what blood type(s) are you 100% sure they could produce in their children?

5. If you have a blood group O father and a blood group B mother, can they produce an O child? Explain your answer.

6. You have a male friend who is blood group AB. He is successful in business but knows very little about biology. His wife just had an O child. Knowing that you have been studying the genetics of blood groups, he asks you for an education on blood groups. What do you think about this situation?

7. A woman is AB and her husband is A. They have a B child. What are all the blood groups possible in their children if he is heterozygous?

8. A woman is Rh- and her husband is Rh+. Their first baby is Rh-. What is the genotype, with respect to Rh, of the parents? What is the probability their next child will be Rh+? Does the woman have to worry about any issues with future children? Explain!

In dragons, the allele causing shiny scales is dominant to dull scales, and the allele causing simple tongue is dominant to forked tongue.

A cross between a shiny forked-tongued dragon and a dull simple-tongued dragon gives 1/4 each of shiny simple, shiny forked, dull simple and dull forked. Does this mean that these genes must be on different chromosomes? (Choose all that apply.)

	A.	Yes, because there are equal proportions of the four genotypes.
	B.	Yes, because all four genotypes are present in the offspring.
	C.	No, because the genes could be far apart on the same chromosome.
	D.	No, because the results could be consistent with the genes being either on the same chromosome or on different chromosomes.

If your blood type is O, what are the possible genotypes of your parents at the locus that controls ABO blood types? Choose all genotypes that either or both of your parents could have.