BIOL 473 Unit 1 UPDATED ACTUAL Exam
Questions and CORRECT Answers
Asexual Reproduction in humans: identical or non-identical - CORRECT ANSWER -
single parent generates offspring that are genetically identical
no meiosis, no reduction in ploidy, no fusion of gametes
No creation of haploid gametes
3 types of Asexual reproduction - CORRECT ANSWER - - budding (portion separates
and grows)
- fragmentation (parent body breaks apart, each piece regenerating into a new animal)
- parthenogenesis
Sexual reproduction unique - CORRECT ANSWER - - two distinct types of gametes
produced in two distinct types of individuals in two distinct types of gonads
- each gonad produces (more or less) distinct types of hormones
- Meiosis
Importance of hormones in sexual reproduction - CORRECT ANSWER - these hormones
act on somatic tissues to produce two distinct phenotypes
distinct physiology and behaviours to ensure that mating occurs at optimal time
prepare female body to support developing embryo
How many chromosomes do humans have? - CORRECT ANSWER - 46 chromosomes
22 pairs autosomes
1 pair sex chromosomes
homogametic - CORRECT ANSWER - Females (XX)
, heterogametic - CORRECT ANSWER - Males (XY)
How is there a wide range of chromosomes within mammals? - CORRECT ANSWER -
Humans = 46
Indian Muntaj = 6
Red Visacha Rat = 12
Are aneuploidies viable? - CORRECT ANSWER - the few liveborn babies with
aneuploidies (0.3%) either have abnormal numbers of the 4 "gene-poorest" chromosomes or of
the relatively "gene-rich" X chromosome
Especially viable if there is a trisomy of Y even X
Are embryos without Y viable (0Y) (YY) (YYY)? - CORRECT ANSWER - No, cannot
survive without X chromosome, cannot be implanted in the utreus
Is XXY normal or not? - CORRECT ANSWER - Normal phenotypic male
What is trisomy X? - CORRECT ANSWER - XXX
What is supermale? - CORRECT ANSWER - XYY
How to get a supermale in meiosis? - CORRECT ANSWER - Nondisjunction in meiosis II
where one haploid cell has 2 Y chromosomes being disomic and one haploid cell has 0
chromosomes called nullisomy forty.
Not separating chromatids in meiosis II
What makes an organism a male? - CORRECT ANSWER - The presence of one Y
chromosome
Questions and CORRECT Answers
Asexual Reproduction in humans: identical or non-identical - CORRECT ANSWER -
single parent generates offspring that are genetically identical
no meiosis, no reduction in ploidy, no fusion of gametes
No creation of haploid gametes
3 types of Asexual reproduction - CORRECT ANSWER - - budding (portion separates
and grows)
- fragmentation (parent body breaks apart, each piece regenerating into a new animal)
- parthenogenesis
Sexual reproduction unique - CORRECT ANSWER - - two distinct types of gametes
produced in two distinct types of individuals in two distinct types of gonads
- each gonad produces (more or less) distinct types of hormones
- Meiosis
Importance of hormones in sexual reproduction - CORRECT ANSWER - these hormones
act on somatic tissues to produce two distinct phenotypes
distinct physiology and behaviours to ensure that mating occurs at optimal time
prepare female body to support developing embryo
How many chromosomes do humans have? - CORRECT ANSWER - 46 chromosomes
22 pairs autosomes
1 pair sex chromosomes
homogametic - CORRECT ANSWER - Females (XX)
, heterogametic - CORRECT ANSWER - Males (XY)
How is there a wide range of chromosomes within mammals? - CORRECT ANSWER -
Humans = 46
Indian Muntaj = 6
Red Visacha Rat = 12
Are aneuploidies viable? - CORRECT ANSWER - the few liveborn babies with
aneuploidies (0.3%) either have abnormal numbers of the 4 "gene-poorest" chromosomes or of
the relatively "gene-rich" X chromosome
Especially viable if there is a trisomy of Y even X
Are embryos without Y viable (0Y) (YY) (YYY)? - CORRECT ANSWER - No, cannot
survive without X chromosome, cannot be implanted in the utreus
Is XXY normal or not? - CORRECT ANSWER - Normal phenotypic male
What is trisomy X? - CORRECT ANSWER - XXX
What is supermale? - CORRECT ANSWER - XYY
How to get a supermale in meiosis? - CORRECT ANSWER - Nondisjunction in meiosis II
where one haploid cell has 2 Y chromosomes being disomic and one haploid cell has 0
chromosomes called nullisomy forty.
Not separating chromatids in meiosis II
What makes an organism a male? - CORRECT ANSWER - The presence of one Y
chromosome
