Question 12 Henry is a spermist -he thinks traits are inherited from the father.

Question

Question 12

Henry is a spermist -he thinks traits are inherited from the father.He is blood type A. His wife, Jane, has just given birth to a child. Jayneis type B.Frank looks at the baby's chart and shouts "Yes, it is mine and I do understand inheritance!!" Given his hypothesis, whatis the baby's blood type?
Answer
A.
It could be any blood type and his hypothesis would be supported.
B.
Type A
C.
Type AB
D.
Type B

Question 13

The white, almost translucent color of polar bear fur conveys an advantage in making them invisible to prey against the whiteof the landscape.This trait has a strong genetic basis, but all polar bears have the genotype that produces white fur.Is this trait currently undergoing selection?
Answer
A.
Probably not, because it is now produced by the bears environment rather than genes
B.
Probably not, because there is no genetic variation and so it can't respond to selection
C.
Probably, because it confers an advantage
D.
Definitely, because it is an adaptation

Question 14

You breed a tomato that is homozygous for leaves cut at the margins and for tall height -both dominant traits (CCTT) to one that is homozygous recessive and has smooth leaf edges and dwarf growth (cctt).
You backcross the F1's to the recessive parental.Which of the following is a genotype you can find in the backcross offspring AND has a parental phenotype?
Answer
A.
CCTt
B.
Cctt
C.
CcTt
D.
ccTt

Question 15

You are mapping chromosomes in tomatoes.The gene for oblong vs round fruit is located 35 centimorgans from the gene for lacy vs round leaves.The gene for axial vs terminal flowers is located 25 centimorgans from the gene for oblong vs round fruit.However, when you backcross to map the genes for leaf shape and flower location, you get a 1:1:1:1 ratio for the different recombinant and parental phenotypes.What do you now know about these genes?
Answer
A.
The genes for leaf shape and flower location are on the same chromosome and located 50 centimorgans apart.
B.
The genes for leaf shape and flower location are on different chromosomes.
C.
The genes for leaf shape and flower location are on the same chromosome and located 60 centimorgans apart.
D.
Because they are assorting independently, you don't actually know whether the genes for leaf shape and flower

Explanation / Answer

Question 12 -

Given that,

Father = blood type A (I^A, I^A or I^A, I^O)

Mother = blood type B (I^B, I^B or I^B, I^O)

A child born to these parents can have the possibility of possessing all the four blood types ( A, B, AB, O).

It can be predicted only when the allele composition of the parents known.

But if we consider that child is having the same blood type as of father then the mother will have I^B, I^O).

A). It could be any blood type and his hypothesis would be supported.

Question 13 –

The white, almost translucent color of polar bear fur conveys an advantage in making them invisible to prey against the white of the landscape. This trait has a strong genetic basis, but all polar bears have the genotype that produces white fur.

The white and translucent color bear confers advantage and protects the bear from UV light. It warms the body of the organism.

About selection

B. Probably not, because there is no genetic variation and so it can't respond to selection. As already all the polar bears were having that genetic trait they won’t under go any further selection.

Question 14
breeding a tomato that is homozygous for leaves cut at the margins and for tall height -both dominant traits (CCTT) to one that is homozygous recessive and has smooth leaf edges and dwarf growth (cctt) is done.

Parents – CCTT (leaves cut at margins and tall height) * cctt (leaves smooth edged and dwarf).

The F1 progeny are all   CcTt

When this CcTt is back crossed with the parental recessive trait then the progeny obtained are

CcTt *   cctt

Progeny-

CcTt – leaves cut at margins and tall height.

ccTt - leaves smooth edged and tall height.

Cctt - leaves cut at margins and dwarf.

cctt - leaves smooth edged and dwarf.

The genotype that is found in the backcross offspring and has a parental phenotype is

C. CcTt

Question 15

The gene for oblong vs round fruit is located 35 centimorgans from the gene for lacy vs round leaves.

The gene for axial vs terminal flowers is located 25 centimorgans from the gene for oblong vs round fruit.

When backcrossed to map the genes for leaf shape and flower location, resulted in a 1:1:1:1 ratio for the different recombinant and parental phenotypes.

It tells about the genes that

C. The genes for leaf shape and flower location are on the same chromosome and located    60 centimorgans apart.

lacy vs round leaves-----35-----oblong vs round fruit------25---- axial vs terminal flowers

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