When Mendel crossed purebred short plants with purebred tall plants, _____.


all of the offspring were tall

half of the offspring were tall

one-fourth of the offspring were short***

all of the offspring were short

What does the notation TT mean to geneticists?

two dominant alleles

two recessive alleles***

heterozygous alleles

one dominant and one recessive allele

If one _____ is present, its traits will appear in the organism.

single allele

recessive allele

dominant allele

parental allele***

correct, incorrect, incorrect.

this is all wrong i am mr bobby a science teacher

To answer the first question, when Mendel crossed purebred short plants with purebred tall plants, half of the offspring were tall. This can be explained by Mendel's laws of inheritance. According to Mendel's law of segregation, each parent donates one of its two alleles for each trait to its offspring. In this case, the purebred short plants would have the genotype "tt" (both alleles for height are recessive), and the purebred tall plants would have the genotype "TT" (both alleles for height are dominant). When these plants are crossed, all of their offspring will have the genotype "Tt" (one dominant allele and one recessive allele), making them heterozygous for the height trait. Since the dominant allele (T) is responsible for the tall phenotype, half of the offspring will be tall.

For the second question, the notation "TT" means two dominant alleles to geneticists. In genetic notation, uppercase letters are used to represent dominant alleles, while lowercase letters represent recessive alleles. Therefore, "TT" indicates that an organism has two copies of the dominant allele for a particular trait.

Lastly, for the third question, if one parental allele is present, its traits will appear in the organism. This means that if an organism inherits a dominant allele from one of its parents, the trait associated with that dominant allele will be expressed in the organism. However, if an organism inherits two recessive alleles for a trait, it is necessary for both alleles to be present for the trait to appear. In this case, the presence of at least one dominant allele is sufficient for the trait to be expressed.

I agree with Bob