Chapter 7 Post Class Assignment

A diploid individual with two identical alleles for a particular gene is said to be:

homozygous for that gene

Albinism (lack of skin and hair pigmentation) is caused by a recessive autosomal allele. A woman and man, both normally pigmented, have an albino child together. For this trait, what is the genotype of the albino child?

homozygous recessive

If, when in a heterozygous state, one allele masks the effect of the other allele, the masked allele is referred to as:

recessive

In the ABO blood type system in humans, there are _________ different alleles, ____________ different phenotypes, and ____________ different genotypes

- 3 - 4 - 6

Which of the following is included in the definition of a phenotype

- certain behaviors an individual exhibits - features visible to the naked eye - chemicals an individual produces, such as in-digesting lactose - outward appearance

In certain plants, red flowers are dominant to white flowers. If a heterozygous plant is crossed with a homozygous red-flowered plant, what is the probability that the offspring will be white-flowered?

0%

Tay-Sachs, which is a recessive lethal disease, results only when individuals possess two copies of the disease-causing allele. Which statement is true about this disease?

Heterozygous individuals may pass on their copy of the disease-causing allele to offspring

A pigmented giraffe (M_) is crossed with an albino giraffe (mm). All of the resulting offspring are pigmented. Therefore, the pigmented giraffe's genotype must be

MM

Which of the following best explains Mendel's law of segregation?

Of the two copies of each gene everyone carries, only one of the two alleles gets put into each gamete

How can two pea plants that have different genotypes for seed color be identical in phenotype?

One of the two plants could be homozygous for the dominant allele, whereas the other could be heterozygous