In horses, the Extension gene helps to determine coat color. The dominant trait (E) produces black pigment in the coat. The recessive trait (e) produces red pigment. Would a cross between a stallion who is homozygous, EE, and a mare who is heterozygous, Ee, ever produce a foal with a red coat?
No, a cross between a stallion with genotype EE (homozygous dominant) and a mare with genotype Ee (heterozygous) would not produce a foal with a red coat. The dominant trait E produces black pigment in the coat, while the recessive trait e produces red pigment. Since the stallion is homozygous dominant (EE), it can only pass on the dominant allele (E) to its offspring. Therefore, all the offspring from this cross will inherit one E allele from the stallion and either E or e allele from the mare. As a result, all the foals will have a black coat color, as the presence of the dominant allele leads to the expression of black pigment.
In horses, the Extension gene helps to determine coat color. The dominant trait (E) produces black pigment in the coat. The recessive trait (e) produces red pigment. Would a cross between a stallion who is homozygous, EE, and a mare who is heterozygous, Ee, ever produce a foal with a red coat?(1 point) Responses Yes, because the stallion's dominant allele and the mare's recessive allele can result in a red coat. Yes, because the stallion's dominant allele and the mare's recessive allele can result in a red coat. Yes, because the mare can pass on her recessive allele. Yes, because the mare can pass on her recessive allele. No, because there would have to be two recessive alleles for the foal to have a red coat. No, because there would have to be two recessive alleles for the foal to have a red coat. No, because the mare cannot pass on her recessive allele.
No, because there would have to be two recessive alleles for the foal to have a red coat.
The allele for curly hair is dominant over the allele for straight hair. If you mated a curly-haired dachshund and a straight-haired dachshund, would you be able to accurately predict the probability of the offspring having curly hair? Why?(1 point) Responses No, because you only know the genotype of the curly-haired dog. No, because you only know the genotype of the curly-haired dog. No, because you don’t know the genotype of the curly-haired dog. No, because you don’t know the genotype of the curly-haired dog. Yes, because you know the genotypes of both dogs. Yes, because you know the genotypes of both dogs. Yes, because you know the genotype of the curly-haired dog.
No, because you only know the phenotype of the curly-haired dog (curly hair), but not the genotype (whether it is homozygous dominant or heterozygous). Knowing the genotype of both dogs would be necessary to accurately predict the probability of the offspring having curly hair.
If you crossed a homozygous (BB) guinea pig for black fur color with a heterozygous (Bb) guinea pig for black fur color, what would be the predicted percentage of homozygous, black-furred guinea pigs?(1 point) Responses 25% 25% 50% 50% 100% 100% 75%
The predicted percentage of homozygous, black-furred guinea pigs would be 50%.
If two parents have black hair, a dominant phenotype, and one of their offspring has blond hair, a recessive phenotype, which would be a true statement about the parents’ genotypes?(1 point) Responses Both parents are homozygous for the trait. Both parents are homozygous for the trait. Only one parent is heterozygous. Only one parent is heterozygous. Both parents are heterozygous for the trait. Both parents are heterozygous for the trait. Only one parent is homozygous. Only one parent is homozygous.
The statement "Only one parent is heterozygous" would be true about the parents' genotypes.
Cats have 38 chromosomes, or 19 pairs. Long hair in cats is a recessive trait (s) while short hair is a dominant trait (S). A cat that is heterozygous for short hair (Ss) and a cat that is homozygous for long hair (ss) are a mated pair. There is a 50% chance of an offspring being heterozygous for short hair, and a 50% chance of an offspring being homozygous for long hair. They have a total of 11 offspring, all of which have long hair. Is this possible? Why or why not?(1 point) Responses Yes, the difference in number of chromosomes would allow this to happen. Yes, the difference in number of chromosomes would allow this to happen. Yes, the probability of any outcome is independent of prior outcomes Yes, the probability of any outcome is independent of prior outcomes No, with fewer chromosomes than humans, the probabilities would be different. No, with fewer chromosomes than humans, the probabilities would be different. No, the 50/50 probabilities mean that at least 50% of the offspring should be homozygous for long hair.
