Biology 11 - Heterozygous female cat or

[Autumngirl]

animals respire all the time but plants respire at night time! CUZ at day time they r photosynthesizing!.....Is this correct?? I choose option B

Plants need energy during the day as well so they photosynthesize AND respire during the day but only respire at night

 

[fariiiii]

so what was d ans?

 

[Lizzie P]

From the question, we can make the assumption that only the dominant short hair allele (H) and the recessive long hair allele (h) control the phenotype of the hair.

This means that the genotypes of any cat can be any one of these:
HH (Short fur)
Hh (Short fur)
hh (Long fur)

In the question, we are told that the mother cat is short haired, so already it is not possible for her genotype to be hh, she must have at least one H allele. In the question we are also told that out of five kittens, three are born with short hair and two are born with long hair. This eliminates the possibility of the mother cat being HH, as if this was the case all of the kittens would inherit the dominant H allele and none of them would have long fur. Her genotype must be Hh for her to produce both types of kittens, therefore the answer is C, the mother must be heterozygous.

It is correct that answer B could also be true, but the question asks what must be true.

The mother's genotype can be proven by using punnet squares. The red represents the mothers genes, the blue represents the father and white is for the offspring.

_|_H__h_
H| HH Hh
H| HH Hh
This cross would result in 100% of the kittens having short fur due to the homozygous father.

_|_H__h_
H| HH Hh
h| Hh hh
This cross would result in a ratio of 3:1 short to long fur.

_|_H__h_
h| Hh hh
h| Hh hh
This cross would result in a ratio of 1:1 short to long fur.

Other punnet squares (using hh or HH as the mother) are either not possible or would result in 100% short haired offspring, as explained previously.

In the question, the ratio of short to long is 3:2, or 2/5. 0.4 lies in between 0.25 and 0.5, but with such a small number of kittens it is impossible to tell whether the father was heterozygous Hh or homozygous hh. Again, the question was asking which option must be correct, and as the sire can be homozygous, option B cannot be true.

Hope that helped a bit.

 

[SherlockHolmes221B]

From the question, we can make the assumption that only the dominant short hair allele (H) and the recessive long hair allele (h) control the phenotype of the hair.

This means that the genotypes of any cat can be any one of these:
HH (Short fur)
Hh (Short fur)
hh (Long fur)

In the question, we are told that the mother cat is short haired, so already it is not possible for her genotype to be hh, she must have at least one H allele. In the question we are also told that out of five kittens, three are born with short hair and two are born with long hair. This eliminates the possibility of the mother cat being HH, as if this was the case all of the kittens would inherit the dominant H allele and none of them would have long fur. Her genotype must be Hh for her to produce both types of kittens, therefore the answer is C, the mother must be heterozygous.

It is correct that answer B could also be true, but the question asks what must be true.

The mother's genotype can be proven by using punnet squares. The red represents the mothers genes, the blue represents the father and white is for the offspring.

_|_H__h_
H| HH Hh
H| HH Hh
This cross would result in 100% of the kittens having short fur due to the homozygous father.

_|_H__h_
H| HH Hh
h| Hh hh
This cross would result in a ratio of 3:1 short to long fur.

_|_H__h_
h| Hh hh
h| Hh hh
This cross would result in a ratio of 1:1 short to long fur.

Other punnet squares (using hh or HH as the mother) are either not possible or would result in 100% short haired offspring, as explained previously.

In the question, the ratio of short to long is 3:2, or 2/5. 0.4 lies in between 0.25 and 0.5, but with such a small number of kittens it is impossible to tell whether the father was heterozygous Hh or homozygous hh. Again, the question was asking which option must be correct, and as the sire can be homozygous, option B cannot be true.

Hope that helped a bit.

You deserve a round of applause. Bravo!

 

[Lizzie P]

You deserve a round of applause. Bravo!

Thank you, Mr Holmes

 

[fariiiii]

The ones who did V1 can u plz tell me
What was da ans for that river thingee/ blood worms /sewage....... Was it A or D???

 

[Ahmad Mubaid]

guys plant respire all the time !!!!!!!!!!!!1

 

[Swapneel Daxini]

guys plant respire all the time !!!!!!!!!!!!1

yup just that they photosynthesise more than they respire during the day and vice versa at night

 

[Swapneel Daxini]

From the question, we can make the assumption that only the dominant short hair allele (H) and the recessive long hair allele (h) control the phenotype of the hair.

This means that the genotypes of any cat can be any one of these:
HH (Short fur)
Hh (Short fur)
hh (Long fur)

In the question, we are told that the mother cat is short haired, so already it is not possible for her genotype to be hh, she must have at least one H allele. In the question we are also told that out of five kittens, three are born with short hair and two are born with long hair. This eliminates the possibility of the mother cat being HH, as if this was the case all of the kittens would inherit the dominant H allele and none of them would have long fur. Her genotype must be Hh for her to produce both types of kittens, therefore the answer is C, the mother must be heterozygous.

It is correct that answer B could also be true, but the question asks what must be true.

The mother's genotype can be proven by using punnet squares. The red represents the mothers genes, the blue represents the father and white is for the offspring.

_|_H__h_
H| HH Hh
H| HH Hh
This cross would result in 100% of the kittens having short fur due to the homozygous father.

_|_H__h_
H| HH Hh
h| Hh hh
This cross would result in a ratio of 3:1 short to long fur.

_|_H__h_
h| Hh hh
h| Hh hh
This cross would result in a ratio of 1:1 short to long fur.

Other punnet squares (using hh or HH as the mother) are either not possible or would result in 100% short haired offspring, as explained previously.

In the question, the ratio of short to long is 3:2, or 2/5. 0.4 lies in between 0.25 and 0.5, but with such a small number of kittens it is impossible to tell whether the father was heterozygous Hh or homozygous hh. Again, the question was asking which option must be correct, and as the sire can be homozygous, option B cannot be true.

Hope that helped a bit.

thats exactly how i thought of it and did it in the exam lol

 

[NiggaFoEva]

Can someone please post the exact question for Variant 1. Because I am pretty sure that the question did not specify the gender of the cat. It only said that there was a "Short haired cat". It didn't say if the cat was male or female or father or mother or dinosaur, It just said "SHORT HAIRED CAT!!!" !!!

 

[Lizzie P]

Can someone please post the exact question for Variant 1. Because I am pretty sure that the question did not specify the gender of the cat. It only said that there was a "Short haired cat". It didn't say if the cat was male or female or father or mother or dinosaur, It just said "SHORT HAIRED CAT!!!" !!!

It said that the short haired cat gave birth.

Traditionally, only female animals give birth . Unless they're seahorses, and although my general knowledge of animals isn't that great, I'm fairly certain that cats =/= seahorses.

I can't say that I've ever heard of catosaurus rex, either.