Answer:
Bull = Pp
Cow A = pp
Cow B = pp
Cow C = Pp
Explanation:
In cows polled (P) is dominant over horned (p) trait.
The bull is polled so it can be PP or Pp. Cow B is horned so it must be pp. Resultant offspring from bull X Cow B is also a horned calf (pp). This calf must have received one p from the bull. So the bull's genotype is Pp.
Cow A is also a horned cow so it must be pp. When bull X Cow A, a polled calf is produced. Since the bull's genotype is Pp and Cow A's genotype is pp, this polled calf will be Pp like the bull.
Cow C is polled like the bull so it can be PP or Pp. However on crossing with the bull (Pp) a horned calf is produced (pp). This calf got one p allele from the bull and p allele from the Cow C. So Cow C's genotype must be Pp.
Hence,
Bull = Pp
Cow A = pp
Cow B = pp
Cow C = Pp
D is not a requirement as good fuel can be in liquid as well as gaseous in nature
The answer is <span>yellow and dominant.
We have two alleles, one dominant and one recessive: Y and y. Usually, a capital letter is used for dominant alleles, so Y is a dominant allele and y is a recessive allele. There are three combinations of those alleles, and thus, three genotypes: YY, Yy, yy.
We know that </span><span>Yy is for yellow seeds. An individual with Yy is heterozygote. Heterozygotes have one dominant and one recessive allele, but the dominant masks the recessive allele, so expressed trait is dominant. Since yellow seed is the result of heterozygous Yy, yellow seed is the dominant trait.
Therefore, Y means yellow and dominant.</span>
