Maddox and Maecy both carry alleles for brown hair. Their 4-year-old son, Drake, also has brown hair. Therefore, Drake is the trait of brown hair.

Option A, Homozygous for

Explanation:

Options for the question are

a)Homozygous for

b)Heterozygous for

c)A carrier of  

d)A recessive of

Solution

Given

Both the parents have allele for brown hair.

Let the allele for brown hair be "b"

Since both the parents are carrier of this allele , it is hence sure that allele "b" is recessive.

Now , let us assume that the dominant allele (for any other hair color) be "B"

Since parents are carrier they must be having heterozygous genotype i.e Bb

Now when two Bb parents are crossed the following offspring are produced

Bb * Bb

BB, Bb, Bb, bb

here only offspring bb will have brown hair, while offspring Bb will be carrier just like their parents and BB will the dominant trait color

Hence, for expression of brown hair color trait, it is compulsory for the offspring to be homozygous for the trait,

Thus, option A is correct

the supermassive black hole is in the middle of the galaxy.

ans.

gregor john mendel is known for study of inheritance in pea plants. he used garden pea plant for his study, having alternative traits for various characters. he performed cross-breeding in pea plants to check how characters are transmitted between parents to offspring, such as cross between pure tall and pure dwarf plant. mendel studied the inheritance patterns in pea plants for various generations.

thus, the correct answer includes options and f).