Alternate Test: Genetics: God's Plan of Inheritance

Match the following: 1. sickle-cell trait 2. Down's syndrome 3. Turner's syndrome 4. hemophilia

1 = trait due to incomplete dominant genes in heterozygous state 2 = trait due to trisomy of chromosomes 21 3 = trait due to genotype XO 4 = trait due to sex-linked recessive gene

The inherited blood disease which particularly affects __________ is sickle-cell anemia.

African tribes

The genetic code is carried by the ________ molecule in most organisms.

DNA

All inherited conditions are apparent at birth.

False

The men who discovered DNA were Mendel and Crick.

False

Complete a Punnett square that shows a test cross for round seeds (RR) with wrinkled seeds (rr). Place the doninant allele at the top of the Punnett Square.

R r R RR Rr r Rr rr

A scientific law may be used to predict the outcome of experiments.

True

According to Mendel's first law, alleles segregate from one another during the formation of gametes.

True

Each chromosome usually contains multiple genes.

True

If a person has one pair of genes for a trait, normally only one of these genes can be transmitted to a offspring.

True

Mature sex cells are called gametes.

True

A normal human body contains: a. 23 pairs of chromosomes b. 46 total chromosomes c. 92 total chromosomes d. 20 pairs of chromosomes e. 1 pair of chromosomes f. 23 chromosomes

a. 23 pairs of chromosomes / b. 46 total chromosomes

Each trait characteristic of a plant is determined by: a. a pair of genes b. one gene c. one dominant gene d. an allele

a. a pair of genes

Suppose you have monohybrid pea plants in your garden and find that they produce round seed to wrinkled seeds in the ration of 3:1. If the alleles are designated (R & r) receptively, what is the probable genotypes of the original plants (P1)? a. Rr & rr b. Rr all c. RR all d. RR & rr

b. Rr all

Which of these genotypes is heterozygous? a. TT b. Tt c. tt d. none of these

b. Tt

What is true about the heterozygous sickle-cell (HbA HbS) condition? a. sickle-cell anemia is not expressed b. sickle-cell anemia is expressed under conditions of oxygen deficiency c. sickle-cell anemia is apparent in men d. none of the above

b. sickle-cell anemia is expressed under conditions of oxygen deficiency

As a result of nondisjunction, a female gamete may contain: a. X and y sex chromosomes b. two sex chromosomes c. three sex chromosomes d. one sex chromosome e. no sex chromosomes

b. two sex chromosomes / e. no sex chromosomes

Why is it wise for a woman who is a carrier of the hemophilia gene to keep her son from being circumcised? a. because the probability of hemophilia would be 100% b. because the probability of hemophilia would be 1:4 c. because the probability of hemophilia would be 1:2

c. because the probability of hemophilia would be 1:2

What is expected concerning the sex chromosomes of sperm? a. they are all "Y" chromosomes b. they are "X" chromosomes c. they are all equal numbers of "X" and "Y" d. they are all the same

c. they are all equal numbers of "X" and "Y"

Each hereditary trait corresponds to: a. a step on the ladder b. arrangement of nucloeotides c. an enzyme d. a sequence of nitrogen bases

d. a sequence of nitrogen bases

A monohybrid cross is made between plants: a. which are identical b. which have experienced only one hybrid generation c. which are self pollinated d. which differ in only one trait

d. which differ in only one trait

The characteristic which results from a monohybrid cross is the __________ trait.

dominant

When the blending of traits occurs, it is referred to as the principle of _____.

incomplete dominance

The calculation of probabilities is based on _______________ events.

random

A hypothesis which appears to be supported by experiments may be called a general ____________.

theory