Biology question?

Question

Crosses between certain white-flowered and red-flowered plants result in pink-flowered offspring. What type of inheritance is this?

Answer 1

This is called incomplete dominance because the dominant allele (red, in this case) doesn't completely mask the recessive allele (white).

The phenotype (the trait you can see) of the offspring is somewhere in between the parent phenotypes--pink. Since the genotypes of these pink offspring still include the recessive white and the dominant red, what color(s) do you think the offspring of two pink-flowered plants could be?

Answer 2

In a way all the answers above are correct. Usually, in genetics, one allele (information for a trait on a gene) is dominant while the other is recessive. To be dominant means that the information on that gene is expressed, and shown in the phenotype.

In some flowers (tulips, notably), one color is NOT dominant over another. This is called incomplete dominance or co-dominance.

Thus, an RR plant would have red flowers, a WW plant would have white flowers, and an RW plant (which is called heterozygous because it has different alleles on the chromosomes), would show a combination of the traits, and thus be pink.

Answer 3

In Mendelian terms, this would be a heterozygous trait. So you would need two copies of the white gene Ww to be a white flower, and two copies of a red gene Rr to be a red flower. Inherit one copy of each (WR, wR, wr, Wr) and you get a pink flower.

Answer 4

Co-dominance?

Answer 5

Co dominance.

Answer 6

incomplete dominance

Answer 7

incomplete dominence

Answer 8

heterozygous I think