Autosomal and X-linked inheritance in practical animal breeding Flashcards
What does Mendel’s law of reciprocity mean?
In case of autosomal genes, inheritance is irrespective of which of the parents transmitted the dominant or recessive genes.
What will be the phenotype of the offspring if a homozygous red Holstein cow is crossed with a homozygous black Holstein bull?
The F1 generation will be uniform black, in the F2 generation black and red calves will be seen.
What will be the phenotype of the F2 generation if a homozygous horned red Holstein cow is crossed with a homozygous polled black Holstein bull?
The male calves will be polled black, while the female calves will be polled red.
Polled black and horned red calves will be seen in the F2 generation.
The F2 generation will be uniform polled black.
The male calves will be polled black and horned black, while the female calves will be polled red and horned red.
Polled black, horned black, polled red and horned red calves will be seen in the F2 generation.
Polled black, horned black, polled red and horned red calves will be seen in the F2 generation.
What kind of cock should we cross with a dwarf hen, if we would like to get normal sized broiler hybrid offspring?A cock which is hemizygous for normal growth.
A cock which is homozygous for normal growth.
There is no possible crossing for this purpose.
A cock which is homozygous for giant growth.
A cock which is heterozygous for normal growth.
A cock which is homozygous for normal growth.
What will be the phenotype of the F1 generation if a homozygous horned red Holstein cow is crossed with a homozygous polled black Holstein bull?
The F1 generation will be uniform polled black
What will be the phenotype of the offspring if a homozygous white Shorthorn cow is crossed with a homozygous red Shorthorn bull?
The F1 generation will be uniform roan, in the F2 generation white, roan, and red calves will be seen.
Will the incidence of haemophilia differ in male and female offsping, if a haemophilia carrier bitch is crossed with a healthy male?
Yes, female offspring will not be haemophilic (they will be carriers only), while a proportion of the male offspring will be haemophilic.
Yes, female offspring will not be haemophilic (they will be carriers only), while each male will be haemophilic.
No, 50% of the male and female offspring will be haemophilic.
Yes, male offspring will not be haemophilic (they will be carriers only), while a proportion of the female offspring will be haemophilic.
No, both the male and female offspring can be carriers only, they will not be haemophilic.
Yes, female offspring will not be haemophilic (they will be carriers only), while a proportion of the male offspring will be haemophilic
What color will the offspring be if a hemizygous silver colored hen is crossed with a homozygous gold colored cock?
Cockerels will be silver colored, while the pullets gold colored.
What does Mendel’s law of uniformity mean?
In case of crossing homozygous parents, the F1 generation will be identical in genotype and phenotype
What will be the phenotype ratio in the F1 generation if two Manx tailless cats are crossed?
Tailless : normal = 2 : 1
