Biology Answers

Zucchini has three autosomal genes that exist on three separate homologous pairs of chromosomes. Each is completely dominant over its recessive form. Here they are:

A = curly shape    B = green color      D = spotted

a = straight shape    b = yellow color      d = unspotted

* Figure out the probability of progeny with curly, yellow, spotted zucchinis arising from the cross of parents with the following genotypes:

   AaBbDd X AAbbDd      Probability = _____________

during glucose catabolism, under an aerobic conditions, glucose molecule is decarboxylated to Co2-. write these decarboxylation reactions

Below is the protocol to make 1 liter of 10* concentrate PBS.

Combine the following:

80g NaCl

2g KCl

14.4g Na2HPO4 (dibasic anhydrous)

2.4g KH2PO4 (monobasic anhydrous)

800ml distilled H2O

adjust pH to 7.4 with HCl

add H2O to 1L

autoclave for 20 minutes on liquid cycle. store at room temperature.

What is the first step to attempt the question, this is my first time doing Biology

a.    Determine the number of individuals in the original population of hamsters that are heterozygous for coat colour. Show all steps used to determine your answer. (3 marks)

b.    How many individuals in the original population of hamsters possess a pink coat colour? (1 mark)

c.     Determine whether evolution has taken place from the original generation to the new generation. Show all steps used to determine your answer. (3 marks)

What is the probability that a women carrying an abnormal X-linked gene has three sons are unaffected?

What is the probability that a women carrying an abnormal X-linked gene has two sons unaffected an one affected? 

What is the probability that a women carrying an abnormal X-linked gene has two sons affected an one unaffected? 

What is the probability that a carrier women will transmit an abnormal X-linked gene to her 3 sons?

What is the probability that a carrier women will transmit an abnormal X-linked gene to her son? 

A 31 year old woman consults her physicain because she is concerned about developing breast cancer. She is currently in good health and she has never had any breast disease. Her concern arises bacause her sister has just been diagnosed as having breast cancer and her mother died of breast cancer.

• How can one determine if the cancer in this family is likely to be a dominantly inherited predisposition?
• What is the woman’s cahnce of developing breast cancer?