1. The ability to roll one\'s tongue (turn up the sides) is controlled by a domi

Question

1. The ability to roll one's tongue (turn up the sides) is controlled by a dominant allele. If two heterozygous parents have a child, what are the chances an offspring will be able to roll their tongues?

A. 100%

B. 75%

C. 50%

D. Zero Chance

E. 25%

2.

The following question is a sex-linked trait. Review the patterns of inheritance of sex-linked traits before answering the following questions. Make sure to indicate chromosomes and alleles in your answers when necessary.

Hemophilia is a caused by a recessive allele found on the X chromosome in humans. The recessive allele (Xh) is associated with abnormal blood clotting (hemophilia), while the dominant allele (XN) causes normal blood clotting.

A woman with normal blood clotting had a father who had hemophilia. What is the woman's genotype?

A. XNYh

B. XNY

C.XNXh

D.XhXh

E.XNXN

Explanation / Answer

1. 75%

since both parent are heterozygous (Ht), on crossing they produce progenies as 1-HH, 2Ht, 1-tt. so HH and Ht i.e. 3 out of 4 offspring can roll their tongue.

2. answer is c - XNXh

since father id XhY, his normal daughter will inherit affected Xh allele from him an d one XN chromosome from her mother. she is normal because the normal X chromosome inhibits the effect oh recesive defected allele.

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